BJCP National · Lesson 15 · Technical pool (P0/R0) · 7 days to exam
Malt groups and kilning temperatures keep sliding because they are being stored as two separate lists. They are one list. The group a malt belongs to is defined by what temperature it saw and in what state – and once the ladder is in your hand, the flavours, the styles and half of the water chemistry fall out of it.
raw/study-guide/BJCP_Study_Guide.pdf (section C. Malts and Adjuncts, by Dave Sapsis) via pdftotext, with [src: …] on each block. Nothing here comes from the unsourced °L/PPG table in the wiki.
Technical topic: Malt, including the malting process, types, adjuncts, kilning and the styles with which different malts are associated. [src: Study Guide, Study Group Outline, Class 1 – Pale Lagers]
That sentence is the answer skeleton, and it is worth copying onto the exam paper before you write a word. Five deliverables: (1) the malting process, (2) types, (3) adjuncts, (4) kilning, (5) styles associated with different malts. A malt answer that is all types and no process, or all process and no styles, is leaving points on the table in the two blocks it never opened. Count the five before you start writing prose.
Everything in the type list is produced by turning two dials on the same grain.
| Dial | Setting | What comes out |
|---|---|---|
| Moisture when the heat arrives | Dry (the normal route) | Colour and Maillard/melanoidin flavour develop on a dry kernel: grainy, then toasty, then biscuit, then roast. This is the whole main ladder. |
| Wet – 50% moisture | The kernel mashes itself inside its own husk: starch becomes sugar before it is roasted. This is the only thing that makes a caramel malt a caramel malt. | |
| Degree of modification | Fully modified vs undermodified | Crystal and amber malts are fully modified first; chocolate and Black Patent are undermodified (less than ½) and simply blasted. |
So the four buckets you already carry – base / crystal / roasted / adjunct – are not wrong, they are just downstream. Base and roasted malts are the same dry ladder at different heights. Crystal is a branch off it at low temperature and high moisture. Adjuncts never enter the kiln at all. Store the ladder; regenerate the buckets.
Malting exists to convert the large, insoluble starch chains of the endosperm to water-soluble starches, and to activate the proteolytic and diastatic enzymes that will reduce proteins and starches in the mash. The important enzymes here are debranching enzymes (break 1-6 links in α-glucans), β-amylase (produces maltose by breaking 1-4 links near reducing ends), and during germination the cytase complex – hemicellulases and β-glucanases – which breaks down cell walls and clears a path for the other enzymes into the endosperm. [src: Study Guide, Malting]
| Step | Temperature | Duration |
|---|---|---|
| Steep | 50–65 °F (10–18 °C) | about two or three days |
| Germinate | 50–70 °F (10–20 °C) | six to ten days (acrospire reaches ~50% at about day six) |
| Raise for enzyme action | 90 °F (30 °C) | held 24 hours |
| Dry | 120 °F (50 °C) | held 12 hours |
The hinge – say this sentence out loud. The malt must be bone-dry before it is heated to kilning temperatures, to prevent the destruction of the enzymes. [src: Study Guide, Malting]
This is why the ladder exists at all, and it is the sentence that turns a list of numbers into an argument: heat on a wet kernel kills the enzymes, so the entire dry ladder is a controlled trade of diastatic power for colour and flavour. It also explains, without extra memorising, why the darkest malts contribute no enzymes and why crystal malt – deliberately heated wet – contributes sugar rather than conversion power.
The ratio of acrospire length to kernel length is the degree of modification; a ratio of 1.0 = fully modified. Continental malt is modified only to 50–75%, which retains more endosperm for fermentability and greater nitrogen complexity, at the price of reduced enzyme activity; American six-row is also 50–75%, but its higher protein and nitrogen give greater enzyme strength. Both Continental and American malts require a protein rest at ~122 °F (50 °C) to degrade albuminous proteins into fractions that promote yeast growth and good head retention. [src: Study Guide, Malting]
| Two-row (Hordeum vulgare) | Six-row | |
|---|---|---|
| Kernels | Bigger kernels, higher yield per kernel | All kernels fertile; more yield per acre |
| Protein / nitrogen | Lower | Higher |
| Husk | Lower husk content, so it tastes less grainy | Extra husk aids the lauter filterbed |
| Diastatic power | Lower | Higher, so it is the choice whenever large amounts of adjuncts are used |
[src: Study Guide, Selection]
Kilning, or roasting the malt, combined with the degree of modification, determines the type and character of the grain. [src: Study Guide, Kilning] Read the table as one ascent, not as eight unrelated facts.
| Malt | Kilning regime | What the heat is doing |
|---|---|---|
| Vienna | Low-kilned, around 145 °F (63 °C) | Colour and acidity developed by kilning higher than a pale malt would be – the historical fix for Vienna's water (below). |
| British & American pale (base) | 130–180 °F (55–80 °C) | Dried with maximum enzyme survival – the diastatic backbone of the grist. |
| Czech | Raised slowly 120 to 170 °F (50 to 75 °C) to dry, then roasted at 178 °F (80 °C) | Slow dry, short roast: pale, but with more kilning character than a stripped-down base malt. |
| Dortmunder | Kilned low before the malt has dried, then slowly raised to 195–205 °F (90–95 °C) | Melanoidins – flavour- and body-building, formed from amino acids and malt sugars. Starting the heat before the malt is dry is exactly what supplies the sugars and amino acids to react. |
| Munich | Same start, then 210–244 °F (100–120 °C) | |
| Amber | Well-modified, dried and rapidly heated to 200 °F (95 °C), then raised to 280–300 °F (140–150 °C) and held until the desired colour | The first true two-stage roast: a dry kernel taken well past melanoidin territory. |
| Crystal / caramel | Fully modified, then kilned at 50% moisture content; raised to 150–170 °F (65–75 °C) and held 1½–2 hours; then heated to the final roasting temperature | Essentially mashes the starches into sugars inside the grain husk. Final time and temperature determine the Lovibond colour index – which is why one malt name spans 10 °L to 120 °L. |
| Chocolate & Black Patent | Undermodified (less than ½), dried to 5% moisture, roasted at 420–450 °F (215–230 °C) for up to two hours depending on the degree of roastiness desired | The high heat degrades the starches, so no protein rest is required for these malts even though they are not fully modified. |
| Smoked | Kilned over smoky beechwood fires, as in Bamberg; whiskey malt similarly over peat | Picks up a rich, heavy smokiness from the phenols in the smoke, which is imparted to the beer. |
[src: Study Guide, Kilning – every row]
Trap: do not "fix" the Vienna number. 145 °F (63 °C) sits inside the 130–180 °F pale-malt band, which feels wrong if you expect Vienna to be a hotter kiln than pale malt. The Study Guide says "low-kilned at around 145 °F" and that is the figure the graders' source carries. The genuine step up on the ladder is at Dortmunder/Munich, where the heat starts before drying. Reproduce the source; do not smooth it into a tidier story under time pressure.
Kilning at the maximum temperature is generally done only until the grains are evenly roasted. They are then cooled to below 100 °F (40 °C) and the rootlets removed. Malts should be allowed to rest for a month or so before being mashed. [src: Study Guide, Kilning] Three cheap sentences that most answers omit – and they belong in the "malting process" deliverable.
Write the kilning ladder cold: eight rows, malt, temperature, what the heat is doing. Then, under it, the one sentence that explains why drying must finish before kilning starts.
Handwrite it. Five minutes, no peeking, whole rows or nothing – a row with the malt but no number is a miss, and so is a number with no "what the heat is doing". This is the block that has been sliding, so it needs production, not another read-through.
Vienna low-kilned ~145 °F (63 °C) · British/American pale 130–180 °F (55–80 °C) · Czech 120 to 170 °F (50 to 75 °C) to dry, then roast at 178 °F (80 °C) · Dortmunder heat before drying, then 195–205 °F (90–95 °C) · Munich same start, then 210–244 °F (100–120 °C), melanoidins from amino acids and malt sugars · Amber dried, fast to 200 °F (95 °C), then 280–300 °F (140–150 °C) to colour · Crystal/caramel fully modified, kilned at 50% moisture, 150–170 °F (65–75 °C) for 1½–2 h to mash the starch to sugar inside the husk, then final roast sets the Lovibond · Chocolate/Black Patent undermodified, dried to 5% moisture, 420–450 °F (215–230 °C) up to two hours, no protein rest needed. Hinge: the malt must be bone-dry before kilning temperatures to prevent the destruction of the enzymes.
If the ladder came out but the temperatures did not, drill the numbers as numbers (SRS deck T15-malt-yeast). If the temperatures came out but the "what the heat is doing" column did not, you have the recall and not the answer – that column is where the flavour vocabulary and the marks live.
An adjunct is any unmalted source of fermentables in brewing. [src: Study Guide, Other Adjuncts] Two families, and the exam question names them explicitly, so give both.
Introduced because they are a cheap source of carbohydrates and make a minimal contribution to wort protein, so they pair with high-protein malts such as American six-row to give a more fermentable wort and a less filling beer. The starches must be gelatinized before mashing, either by a preliminary boil in the double-mash procedure or by flaking through hot rollers. Common ones: corn (flaked maize, refined corn grits, corn starch, corn grits), rice grits, sorghum (in Africa), flaked barley, flaked rye, wheat (hard red winter or flaked). Corn and rice are used heavily in the American light lager styles; raw wheat is a key ingredient in Belgian white and lambic beers. [src: Study Guide, Cereal Adjuncts]
| Adjunct | Effect |
|---|---|
| Corn and cane sugars | Cheap sugar, fully fermentable, tending to yield more alcohol and dry out the beer. |
| Honey | Common in specialty beers; contributes some aromatics, but the high sugar content tends to make the beer thinner and more alcoholic than its all-malt counterpart. |
| Malto-dextrin syrup / powder | Used to achieve a fuller palate; the dextrin content can also be raised by adjusting the malt bill or the mashing procedure instead. |
| Caramel, molasses, maple syrup, licorice | Add colour, flavour and fermentables. |
[src: Study Guide, Other Adjuncts]
Wheat is the most widely used malted grain besides barley: key in German and American wheat beers, and used in small quantities elsewhere to improve head retention. It has sufficient diastatic power to break down its own proteins and starches, but having no husk it is usually mashed with barley malt so an adequate filter bed forms during lautering. Its protein and β-glucan content is high compared with barley, so large quantities may need an extended protein rest. Rye, oats and sorghum are also malted, but are more commonly used raw. [src: Study Guide, Other Malted Grains]
The strongest version of this deliverable is not a list of pairings – it is the historical argument that kilning temperature and local water built the styles together. The Study Guide makes that argument itself, and it is where a compare/contrast history section stops being generic.
| City | Water problem | Malt answer, and the style |
|---|---|---|
| Vienna | Calcium too low to balance the bicarbonate, so pale lagers could not reach a low enough pH | By kilning malt at higher temperatures the malt developed more colour and acidity – this led to the birth of the reddish-amber Vienna Lager. |
| Dublin | An even greater calcium/bicarbonate imbalance than Vienna | Irish Stout, brewed with a high percentage of roasted barley and malts; relatively high IBU, but the finish is softened by low sodium, chloride and sulfate. |
| London | Bicarbonate nearly twice the calcium | Brewers were forced to use a higher percentage of dark malts to balance mash pH, giving Dark Mild and English Porter (smoothed further by high sodium, low sulfate). |
| Munich (and Edinburgh) | Remarkably similar mineral profiles; carbonate-heavy | The darker malts of amber and dark German lagers and Scottish ales balance the carbonates and acidify the mash, yielding a very smooth malt character; low sulfate gives mellow bitterness. |
[src: Study Guide, Water and the development of beer styles]
The mechanism underneath all four rows, in numbers: using a dark crystal or roasted malt for 20% of the grainbill can reduce the pH by 0.5, usually enough to bring it into the 5.1–5.5 range for starch conversion. The alternative levers on pale beers are lactic or phosphoric acid in the liquor, or acidulated malt (lactic acid from naturally occurring lactobacillus on the grain). [src: Study Guide, mash pH]
Direct malt-to-style pairings the source supports outright: roasted barley, Irish Stout; Pilsner malt's grainy character, acceptable in most pale lagers (International Pale Lager, German Pils, German Helles Exportbier); wheat malt, German and American wheat beers; beechwood-smoked malt, Bamberg; corn and rice, American light lagers; raw wheat, Belgian white and lambic.
Write the malt answer in its five parts – process, types, adjuncts, kilning, styles – in ten minutes, and count the parts before you start.
Full sentences, exam voice. The scoring risk on this question is not accuracy, it is an unopened block: the answer that spends ten minutes on types and never mentions gelatinizing cereal adjuncts or resting malt for a month.
Process: steep 50–65 °F, germinate 6–10 days at 50–70 °F, modification as acrospire:kernel ratio with 1.0 = fully modified, Continental and US six-row 50–75% and therefore a protein rest at ~122 °F, dry to bone-dry before kilning or the enzymes die, cool below 100 °F, remove rootlets, rest a month. Types: the ladder, eight rows, with temperatures. Adjuncts: definition (any unmalted source of fermentables), cereal adjuncts must be gelatinized (double mash or flaking), sugars dry the beer out, honey thins it, malto-dextrin fills it. Kilning: dry ladder vs the 50%-moisture crystal branch; melanoidins at Dortmund/Munich; final time and temperature set Lovibond for crystal. Styles: Vienna, Dublin, London, Munich as the water-plus-kilning argument, plus the direct pairings.
Five blocks, roughly two minutes each. If one block is thin, it is worth more to add two sentences there than to deepen a block that is already scoring.
Two scales: EBC in Europe, SRM in the USA; both run low-to-high with low numbers lighter. Anchors the Study Guide gives: American light lager ~2–3 SRM, Pilsner 2–5, Oktoberfest 7–14, Dunkles Bock 14–22, some stouts over 60 and essentially opaque. Colour is primarily determined by the malt, but the intensity and length of the boil also play a role. [src: Study Guide, Color]
The kernel also carries the material for two faults you are asked about elsewhere: cellulose, polyphenols and tannins live in the husk and lead to harsh flavours if leached out by hot or alkaline sparge water; and fatty acids and lipids support the embryo during malting but produce oxidative off-flavours and low head retention if carried into the wort in excess. Protein content is an indication of the malt's enzymatic strength (enzymes are proteins), and the phosphates in the malt are responsible for the acidification of the mash. [src: Study Guide, Malt Content]
Sourcing note. The °L and PPG columns in wiki/brewing-science/T15-malt-yeast.md – Maris Otter 3–4 °L / 38 PPG, Carapils, "melanoidin malt 25–35 °L", crystal 60 L – are not from either sacred source. They are trade figures that were never gated. They are fine as working knowledge at the brewery; under exam pressure, write what this lesson carries – kilning regimes and the Study Guide's own colour anchors – because that is what the graders' source contains. If you want a number for a specialty malt and cannot source it, describe the kilning instead: it scores as understanding rather than as a figure that may be wrong.