Some dyes are set with salt and it is used with many of the household dyes which are always sold with directions on the package. When buying direct from the manufacturers, their chemists will always give the necessary information as to which acids should be used with the various colours.
This book is not intended to be a technical treatise and readers who wish to know more of the chemistry of dyeing are advised to study Prof. Chas. E. Pellew’s “Dyes and Dyeing.”
TERTIARY COLOURS
The tertiary colours are all in the brown tones and the following table may prove a useful guide.
Blue + orange + yellow produce gold.
Red + green + blue produce blue-brown.
Yellow + purple + red produce red-brown.
Green + orange + red produce orange-brown.
Orange + blue + purple produce bronze.
Purple + yellow + green produce green-brown.