Manufacturer and builder 12, 1882
Take the ordinary cake blue, which consists of indigo and starch, and powder to make dry laundry blue. For soluble blues, several recipes are given below: Take 1 ounce of soft Prussian blue, powder it, put in a bottle with 1 quart of cleand rain-water, and add ¼ ounce of oxalic acid. Or, mix 4 parts of Chinese blue, 1 of Turnbull's blue and 1 of oxalic acid; gradually add boiling water until the whole is dissolved, then add lastly 4 parts of sulphate of indigo. The latter is made by treating 1 part of indigo with 4 of sulphuric acid, and neutralizing with carbonate of ammonia.
Ei kommentteja :
Lähetä kommentti