Name: Best Baking Powder
Ingredients: 4 parts tartaric acid (by weight); 5 parts bicarbonate of soda (by weight); 9 parts baked flour (by weight)

Best Baking Powder

Ingredients

4 parts tartaric acid (by weight)
5 parts bicarbonate of soda (by weight)
9 parts baked flour (by weight)

Directions

Ensure the flour is completely dry.
Dry and finely pulverize the tartaric acid and bicarbonate of soda separately in a clean porcelain mortar.
Sift all ingredients together repeatedly until perfectly mixed.
Store in well-corked bottles.
Use 2 teaspoons of this baking powder for each pint 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.