Rye and wholegrain bread formulas: sourdough percentages, hydration and crumb density

Rye-content ladder: how rising rye percentage raises hydration, demands sourdough and densifies the crumb

1. The rye-content ladder

Everything about a rye or wholegrain loaf is governed by one number: what percentage of the flour is rye. As rye rises, hydration rises, sourdough goes from optional to non-negotiable, and the crumb gets denser, moister and longer-keeping. The full picture is in the table "Rye-content ladder" in data.json, and the hero diagram above shows it at a glance. [src-bp-ryebread, src-tpl-90rye, src-mgr-mischbrot]

Like every formula in this Academy, the recipes here are written in baker's percentage: each ingredient is a percentage of the total flour weight, which is always 100%. [src-ka-bakers-pct] The master lever remains hydration:

Hydration (%) = (water weight / flour weight) x 100 [src-ka-hydration, src-tpl-hydration]

The calculation does not change with flour type, but the right number does. Wholemeal wheat and rye drink far more water than white flour because the bran, germ and (in rye) the pentosans are "thirsty". A typical wholemeal wheat sits around 72%, while high-rye doughs run 80-90%+. [src-tpl-hydration, src-ka-hydration]

2. Why rye is not wheat

This is the single idea that makes rye baking make sense. Rye contains secalins, not the gliadin/glutenin gluten of wheat, so it cannot build a strong, gas-trapping gluten network. Instead rye crumb is held together by starch gelatinisation and pentosans. [src-bp-ryeingredient] That has two consequences:

• Rye is mixed, not kneaded. A high-rye dough is a sticky paste; long mixing achieves nothing.
• Rye must be acidified. Rye flour is rich in alpha-amylase that stays active into the starch gelatinisation range during baking - left unchecked it degrades the starch and gives a wet, gummy crumb. Sourdough lowers the pH and suppresses the enzyme (its optimum is pH 5.0-5.5; it is suppressed at lower pH), and pH around 4.2 or below is the industry target for a finished rye sour. [src-ireks-acidification, src-bp-ryeingredient]

Why rye needs sourdough: alpha-amylase activity falls as dough pH drops below ~4.2

So sourdough is required above roughly 30% rye; below ~25% rye, a wheat-led sponge is enough. [src-bp-ryeingredient, src-bp-ryebread] The contrast between white and wholegrain behaviour is tabulated in "Wholegrain vs white: why the rules change" in data.json.

3. Three rye pre-builds: sour, soaker, shortcut

Rye sour, soaker and ready concentrate feeding into a final rye dough

Rye formulas are built from components prepared ahead of the final mix:

• Rye sour (levain): part of the rye flour fermented with a culture to drop the pH. The bigger the rye fraction, the bigger the sour - pre-fermented flour climbs from ~20% in a deli rye to ~45% in a 90% rye (see the diagram below and img-a8rw-12). [src-bp-ryebread, src-tpl-90rye]
• Soaker: coarse grains, cracked rye / rye chops, or even toasted old bread, pre-hydrated so they soften and do not steal water from the dough - improving crumb softness, sweetness and keeping quality. [src-soaker, src-ka-oldbreadrye]
• Shortcut: a ready rye sourdough concentrate or a complete mix that delivers the acidity instantly and consistently (Section 9).

Pre-fermented flour rises with rye content across the formulas

4. Handling and choosing the flour

Handling sticky rye dough: mix to a paste, scrape into a tin, smooth with wet hands

Handle rye with wet hands and tools, mix only to a homogeneous paste, bake dense ryes in tins, and rest dense loaves up to 24 hours before slicing to avoid a gummy cut. [src-tpl-90rye, src-hamelman-vollkornbrot, src-bp-ryebread]

For the flour itself, match the grade to the style (full detail in "Rye and wholemeal flour grades" in data.json). Rye is graded by extraction just like wheat: white rye (Type ~720, ash <0.78%), medium rye, dark/wholemeal rye (Type 2000, ash <2.0%), and pumpernickel flour = whole rye meal. Rye chops are coarsely cracked whole kernels for soakers. [src-ka-ryetypes, ss-rye720, ss-rye2000, ss-cracked-rye] On the wheat side, graham / wholemeal wheat (Type 1850, ash <2.0%, protein ~12.3%) carries the structure in mixed ryes and wholemeal loaves. [ss-graham1850, ss-doves-wmrye, ss-doves-wmwheat] All of these contain gluten and must be declared. [ss-rye720, ss-graham1850, ss-windrush]

From the catalogue: GoodMills Rye Type 720 and Komplexmłyn Rye Type 720 (light rye), GoodMills Wholemeal Rye Type 2000 and Doves Organic Wholemeal Rye (dark rye), Agrol Cracked Rye (chops), and for the wheat side GoodMills Graham Type 1850, Komplexmłyn Wholemeal Wheat Type 1850, Doves / Grampian / Chiltern / Carr's wholemeal wheat and Windrush Strong White. Where a high-bran or high-rye blend needs shoring up, add 1-3% vital wheat gluten (Beneo VWG, protein ~82%). [ss-vwg, src-bp-ryebread]

5. Roggenmischbrot: the everyday mixed rye

Sliced German Mischbrot rye-wheat sourdough loaf

The Central-European daily bread is a rye-dominant mix - more than half rye, raised on a rye sour plus a little yeast. By German convention, Roggenmischbrot means over 50% rye. [src-mgr-mischbrot] Formula card formula-roggenmischbrot computes the My German Recipes loaf as ~68.6% rye / 31.4% wheat, ~67% hydration (510 g water / 765 g flour), 1.3% salt, 0.9% yeast, with the rye sour pre-fermenting ~34.6% of the flour. [src-mgr-mischbrot] Build the sour 24 hours ahead, mix to a sticky dough, proof 60+ minutes, then bake ~10 min at 240C then ~40 min at 200C with steam, and cool fully before slicing. [src-mgr-mischbrot]

For a pure-levain version that also recycles waste, formula card formula-old-bread-rye (King Arthur professional) runs two-thirds rye (33% whole + 33% medium) and 34% white, 75% hydration, 2% salt, plus a 10% toasted old-bread soaker, total yield 187%. [src-ka-oldbreadrye] Its sour is whole rye at 83% hydration with 5% culture, built 16 h, the soaker is made at 200% hydration, dough temperature is 80-82F (27-28C), and it bakes at 450F (230C) ~50 min for a 1 kg loaf. [src-ka-oldbreadrye]

6. Light deli rye and dark pumpernickel: the two extremes

A light deli rye is wheat-led: formula card formula-deli-sponge-rye (BAKERpedia) is ~25% rye (20% in a sponge, 5% in the dough) and 75% wheat, 64% hydration, 2% salt, with optional caraway. [src-bp-ryebread] The wheat carries the structure, so it mixes and proofs more like a wheat bread: sponge 3-4 h, short mixing, final proof 92-95F (33-35C) at 85% RH for 30-40 min, baked to an internal 204F (95C). [src-bp-ryebread]

Dark dense pumpernickel rye bread crumb

At the other extreme, pumpernickel is built on whole rye meal. Formula card formula-pumpernickel (BAKERpedia) is 70% rye meal + 30% clear wheat, a rye starter at 40.5% (20% rye + 20% water + 0.5% yeast), 55% water, 1% yeast, 2% salt, 3% honey/molasses, 0.2% caramel colour, 0.5% caraway - overall hydration ~62% counting the starter. [src-bp-pumpernickel] The dark colour and sweet-malty flavour come from molasses + caramel via Maillard browning and caramelisation; use Molasses Sugar and rye malt from the catalogue for the colour role. [src-bp-pumpernickel, ss-somex]

7. High-rye sourdough and 100% wholegrain Vollkornbrot

Sliced 90% rye sourdough with a dense, moist, dark crumb

Push the rye higher and the sour gets bigger. Formula card formula-90-rye-sourdough (The Perfect Loaf) is 90% whole dark rye + 10% white, 90% hydration, 1.8% salt, with a 100%-rye levain that pre-ferments 45% of the flour. [src-tpl-90rye] That large sour drives the pH low from the start, exactly as Section 2 demands. Dough temperature is 82F (28C), bulk is a very short ~20 min, final proof ~1 h, and it bakes 450F 30 min with steam then 400F 30-35 min to an internal 200-204F; rest a day before slicing. [src-tpl-90rye]

The wholegrain pinnacle is Vollkornbrot - 100% rye as a blend of meal and cracked grain. Formula card formula-vollkornbrot (after Hamelman) is 68.4% rye meal + 31.6% rye chops, 82.1% hydration, ~2% salt, with 60% of the rye meal pre-fermented (~41% of total flour) and the chops held in a 100%-hydration soaker. [src-hamelman-vollkornbrot, src-soaker] Add 5-10% sunflower or flax seeds if you like. Mix to a wet paste, pack into a tin, proof until the surface cracks, bake low and long, and rest 24 h. Use Agrol Cracked Rye for the chops and Bioveri Sunflower Seeds for the inclusion.

Cracked rye / rye chops for the Vollkornbrot soaker

8. Wholemeal wheat: a soft sandwich loaf

Sliced wholemeal wheat sandwich loaf with a soft even crumb

Not every wholegrain loaf is dense. Formula card formula-wholemeal-wheat-panloaf (King Arthur's Classic 100% Whole Wheat) is a soft, enriched 100% wholemeal pan loaf: flour 100%, water 75%, honey 21.25%, oil 12.5%, dried milk 7.5%, ~1.75% salt, ~2% yeast, baked at 350F (175C) for 40-50 min to an internal 190F (88C). [src-ka-classic-ww] The honey, oil and milk keep the crumb soft and extend shelf life; declare MILK as well as wheat gluten. [src-ka-classic-ww, ss-doves-wmwheat] For a leaner, much higher-hydration wholemeal sourdough sandwich (~90% hydration, ~2.1% salt with a cold retard) see the cited The Perfect Loaf reference. [src-tpl-wwsandwich] Good catalogue flours here are GoodMills Graham 1850, Doves Strong Wholemeal, Grampian, Chiltern and Carr's Bakers Wholemeal. If your wholemeal is low in protein, add 1-3% vital wheat gluten. [ss-vwg, src-bp-ryebread]

9. Catalogue shortcuts: ready rye sours and complete mixes

Uldo dark rye sourdough concentrate

If you do not keep a rye sour, the catalogue carries acidified concentrates and complete mixes that deliver consistent acidity straight from the spec sheet (full dosages in "Ready-to-use rye sourdough products" in data.json). Formula card formula-concentrate-shortcut shows a 50/50 rye-wheat dough acidified with 4% Uldo Sauer Dark Rye concentrate (within its 2-8% range), 68% water, 2% salt, 1.5% yeast - no overnight build. [ss-uldo-sauer] Equivalent doses within spec: IREKS Natural Liquid Rye Sour 1-7% (pH 2.8-3.4), Zeelandia Bioferm Dark 2.5-4%, Superkwas (dry) ~1.3%. [ss-ireks-ryesour, ss-zeelandia-bioferm, ss-zeelandia-superkwas]

IREKS 100% rye bread mix - a complete all-in-one mix

The ultimate shortcut is a complete mix: IREKS 100% Rye Bread Mix is added at 100% (it already contains rye flour, salt, rye malt flour and dried rye sourdough) - just add water and yeast per the leaflet. [ss-ireks-ryemix] The catalogue also stocks Komplet Żytniak CL and Zeelandia Hearty Rye mixes, and Backaldrin BAS and Lesaffre AS ECOL rye sours. Dose strictly to the spec - over-dosing makes the loaf sharp and can over-soften the dough.

10. Faults, fixes and food-safety

The faults specific to rye and wholegrain - gummy crumb, sticky unmanageable dough, dense low loaves, flying crust, over-sour, dry wholemeal, pale crust - and their remedies are in "Rye and wholegrain fault diagnosis and remedies" in data.json. [src-ireks-acidification, src-bp-ryebread, ss-vwg] The recurring theme: most rye problems trace back to too little acidity, treating rye like wheat, or under-baking and slicing too soon.

Food-safety / allergen flag (human review required): All rye and wheat flours, rye meal and rye chops contain gluten and must be declared under EU Regulation 1169/2011 Annex II / UK FIR 2014. [ss-rye720, ss-rye2000, ss-graham1850, ss-cracked-rye, ss-windrush] Note: Section 2 describes rye proteins as "secalins" to explain the absence of a wheat-type gluten network; rye is nonetheless a gluten-containing cereal under food law and allergen declaration for rye products is mandatory.

Allergen discrepancy — Uldo Sauer (verify before use): The Uldo Sauer spec sheet declares gluten as barley (barley malt ingredient), yet rye bran and rye flour are primary ingredients. A product containing rye should declare rye gluten; the barley-only listing may be incomplete. Verify the current product label — if both barley and rye gluten apply, both must be declared. [ss-uldo-sauer] The five listed cross-contamination allergens (milk, sesame, soy, lupin, egg) are all EU/UK Annex II allergens and each must appear on the label of any product using this concentrate.

Zeelandia Bioferm Dark contains MILK — any rye bread using this concentrate must declare milk even though it resembles a pure rye ingredient. Zeelandia figures are carried from the A2 dossier first-party reads; re-verify against current Zeelandia labels before use. [ss-zeelandia-bioferm, ss-zeelandia-superkwas] The IREKS rye sour and 100% rye mix are rye-gluten. [ss-ireks-ryesour, ss-ireks-ryemix]

The soft wholemeal pan loaf contains MILK (nonfat dried milk powder) and wheat gluten; honey is present. [src-ka-classic-ww] Pan-loaf salt and yeast weights were converted from teaspoons and are approximate — verify against the current King Arthur recipe before production.

Sunflower and flax seeds carry no mandatory EU/UK Annex II allergen declaration, but cross-contamination with gluten is a facility-specific risk; whether a "may contain" statement is legally required depends on your own allergen risk assessment, not on a blanket rule. [ss-sunflower]

Mycotoxin risk: Rye and wholegrain rye products are susceptible to deoxynivalenol (DON), zearalenone (ZEA) and ergot alkaloids regulated under EU Regulation 1881/2006. Source from audited suppliers with certificates of analysis; keep cracked rye and rye meal below 14% moisture during storage to prevent mould formation. [ss-cracked-rye]

Missing internal temperatures (Mischbrot and pumpernickel): The Roggenmischbrot and pumpernickel formula processes do not state a target internal temperature. Production SOPs must include probe thermometer verification; a minimum internal temperature of 95°C / 200°F is recommended for all dense tin-baked rye loaves. Dense rye loaves rested before slicing should be kept covered in a cool area (≤18°C / 65°F) during the rest period to prevent surface contamination.

German bread naming: The label "Roggenmischbrot" is a regulated designation under the German Leitsätze für Brot und Kleingebäck (51-89% rye flour); the My German Recipes blog source used for this dossier is not authoritative for this classification — verify against current German food-law guidance if using this name on a product label. [src-mgr-mischbrot]

Re-verify every allergen, dosage and regulatory claim against current supplier specifications and applicable EU/UK legislation before any customer-facing labelling or production use.

11. Quick buying guide

| Need | Catalogue product | |---|---| | Light rye (Type 720) | GoodMills Rye Type 720; Komplexmłyn Rye Type 720 | | Dark / wholemeal rye | GoodMills Wholemeal Rye Type 2000; Doves Organic Wholemeal Rye | | Rye chops for soakers | Agrol Cracked Rye | | Wholemeal wheat (graham) | GoodMills Graham 1850; Komplexmłyn Wholemeal 1850; Doves / Grampian / Chiltern / Carr's | | Strong white (wheat side) | Windrush Strong White Bread Flour | | Ready rye sour concentrate | Uldo Sauer Dark Rye; IREKS Natural Liquid Rye Sour; Zeelandia Bioferm Dark; Backaldrin BAS; Lesaffre AS ECOL | | Complete rye mix | IREKS 100% Rye Bread Mix; Komplet Żytniak CL; Zeelandia Hearty Rye | | Dough strengthener | Beneo VWG Vital Wheat Gluten | | Crust colour / malt | IREKS Somex Malt Extract; Uldo Rye Malt Extract; Lithuanian Dark Rye Malt; Molasses Sugar | | Seeds / spice | Bioveri Sunflower Seeds; Ros-Sweet Caraway Seeds | | Yeast | Fermipan Red (instant); Benevia (fresh) | | Salt | Sea Salt Extra Fine |

All eight formulas, the four comparison tables, the fault table and the key specs are in data.json; image briefs are in images.json; sources are in sources.json.