The Manufacturer and Builder 3, 1883.
First sponge the wood with a solution of chlorhydrate of aniline in water, to which a small quantity of copper chloride is added. Allow it to dry, and go over it with a solution of potassium bichromate. Repeat the process two or three times, and the wood will take a fine black color, unaffected by light or chemicals.
Ei kommentteja :
Lähetä kommentti