"There is a strong and well-founded preference among art producers in favor of vegetable dyes, and yet it is possible to use certain of the aniline colors, especially in combination, in safe and satisfactory ways.
The variety of shades
"Everyone who undertakes domestic weaving must know how to dye one or two good colors. Black, of course, and the half-black, or gray, which a good colorist of my acquaintance calls a light black. Indigo blue equally, of course, in three shades of very dark and light. Here are seven shades from the three dyes, and when we add white we see that the weaver is already very well equipped with a variety of color. The eight shades can be still further enlarged by clouding and mixing. The mixing can be done in two ways, either by carding two tints together before spinning, or by twisting them together when spun.
Carding and twisting
"Carding together gives a very much better effect in wool, while twisting together is preferable in cotton.
Blue
Pink
Gray
Clouding
"Dark blue and white and medium blue and white wool carded together will give two blue grays which cannot be obtained by dyeing, and are most valuable. White and red carded together give a lovely pink, and any shade of gray can be made by carding different proportions of black and white or half-black and white. A valuable gray is made by carding black and white wool together, and by black wool I mean the natural black or brownish wool of black sheep. Mixing of deeply dyed and white wool together in carding is, artistically considered, a very valuable process, as it gives a softness of color which it is impossible to get in any other way. Clouding, which is almost an indispensable process for rug centers, can be done by winding certain portions of the skeins or hanks of yarn very tightly and closely with twine before they are thrown into the dye pot. The winding must be close enough to prevent the dye penetrating to the yarn. This means, of course, when the clouding is to be of white and another color. If it is to be two shades of one color, as a light and medium blue, the skein is first dyed a light blue, and after drying, is wound as I have described, and thrown again into the dye pot, until the unwound portions become the darker blue which we call medium."