Name: To Make Baking Powder
Ingredients: 6 oz bicarbonate of soda; 4 oz tartaric acid; 2 oz fine sugar; 1 oz coarse sea salt (formerly 'bay salt')

To Make Baking Powder

Ingredients

6 oz bicarbonate of soda
4 oz tartaric acid
2 oz fine sugar
1 oz coarse sea salt (formerly 'bay salt')

Directions

Mix all ingredients together.
Use 1 teaspoon of the mixture for every pound of flour.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

What each ingredient does

Bicarbonate of soda: Reacts with the acid to release carbon dioxide gas, which makes baked goods rise.
Tartaric acid: Reacts with the bicarbonate of soda to produce the gas that leavens the dough or batter.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.