By Rıza Yılmaz, İmesta Food IT2 min read
In a bakery product, cocoa does more than colour and flavour. It changes the acid balance of the dough, and with it the rise, the spread and the final colour after baking. That is why a cocoa change that looks harmless on paper can produce a different biscuit on the line.
Cocoa is part of the leavening system
Baking soda (sodium bicarbonate) needs an acid to release carbon dioxide. Natural cocoa, at around pH 5.7, supplies some of that acid. In recipes built on natural cocoa, the cocoa is quietly part of the leavening.
Alkalized cocoa has had most of that acidity neutralised. It does not react with baking soda in the same way. Recipes built on alkalized cocoa usually rely on baking powder, which carries its own acid.
The most common reformulation mistake
Changing the cocoa without changing the leavening.
- Natural → alkalized, same soda: less lift, a denser crumb, and often a soapy or metallic note from unreacted soda.
- Alkalized → natural, same system: the extra acid reacts with soda it was not meant to meet, changing rise and spread, and the colour turns lighter and redder.
Any cocoa change in a baked product should be treated as a reformulation, with a test bake, not as a like-for-like swap.
Colour after baking
Dough pH affects colour during baking. More alkaline doughs bake darker, so alkalized cocoa gives deeper colours than its dry powder suggests, and natural cocoa with soda can bake to a reddish brown.
| Target | Grade | pH | Colour of powder |
|---|---|---|---|
| Light cocoa note, soda-leavened | İ6 (natural) | 5.7 ± 0.3 | Light brown |
| Warm reddish brown | İ8 | 7.0 ± 0.3 | Reddish brown |
| Dark brown cake or cookie | İ10 / İ9 | 7.5 ± 0.3 / 7.8 ± 0.3 | Dark brown |
| Dark colour at moderate pH | MS10 | 7.0 – 7.5 | Blackish brown |
| Black biscuit or cookie shell | İ12 | 8.5 ± 0.3 | Black |
Judge colour on the baked product, under the same light, against a reference.
Fat, fineness and moisture
- Fat (10–12 %): carries flavour and softens the crumb. Higher-fat powders cost more.
- Fineness (99.5 ± 0.3 %): a fine powder mixes evenly and avoids specks in light doughs and creams.
- Moisture (5 % max): keeps powder free-flowing in silos and dosing systems.
Fillings and creams
Sandwich-biscuit creams, wafer fillings and spreads are not baked after mixing. Here cocoa behaves more like it does in confectionery: colour and flavour matter, leavening does not, and microbiological limits become more important because there is no heat step to reduce counts.
Switching cocoa safely
- Note the current cocoa’s pH and colour, and the leavening system.
- Choose the new grade by target colour and pH.
- Adjust the leavening if moving between natural and alkalized.
- Do a test bake and compare rise, spread, colour and flavour against the current product.
See how cocoa behaves in baked goods on the bakery and biscuit page, compare natural and alkalized grades, or request a sample for a test bake.
Frequently asked questions
Should I use natural or alkalized cocoa for baking?
Use natural cocoa when the recipe relies on baking soda and you want a lighter, sharper result. Use alkalized cocoa when you want a darker colour and milder flavour, with baking powder or adjusted leavening.
Why did my cake rise less after changing cocoa?
If you replaced natural cocoa with alkalized cocoa, the acid that reacted with baking soda is gone. The leavening needs adjusting, usually by adding an acid source or switching part of the soda to baking powder.
Which cocoa powder makes black biscuits?
A heavily alkalized grade. In İmesta Food's range, İ12 at pH 8.5 ± 0.3 is the black end of the scale and is used for black biscuits and sandwich-cookie shells.
Does cocoa fat content matter in baking?
Yes. Higher fat softens the crumb and carries more flavour. Most bakery formulations use 10–12 % fat powder.
