Shading
Directions for shading
"Much skill can be shown by an artistic worker in the use of slight shades of difference in the same color. For example, in the plain center of a rug, several tones representing shades of the same color will give the effect of a play of light on a silky surface, which is very beautiful. By using material that has been dyed a trifle darker at one end of the rug, and working in gradually lighter tones, the result is surprisingly effective. To do this, each three or four yards should be dyed with these slight differences of tone; then when within thirty strips of the end of one color (more or less, according to the width of the rug), work in a broken line of the next tone all across the rug. Then use a few rows (not worked in single rows, however) of the first color across the entire rug, then a wider broken line of the second color. Broken lines blend better than continuous lines do. The portions of the second line should fall above the broken spaces left in the first line (in the same way that masons lay bricks), then a little more of the first color, using less and less of it, and increasing the width of the second in masses, until the first color has become only broken lines upon the ground of the second color. All the way through, any changes of color should be merged in this way. Be sure to work this method from side to side across the rug, as the frameful is filled.
Coloring
"This is the most difficult feature of the whole handicraft, the actual coloring, and yet for fine effects I should recommend only the use of hand-dyed materials. Goods dyed by professional dyers are perfectly uniform in color throughout, and rugs made of such material will have nothing of that difference of tone, that play of color, that is absolutely necessary for beauty.
Dye kettles
"In dyeing use only brass, copper, granite, or porcelain kettles, unless one goes into it on a large scale and uses regular machinery. Brass and copper vessels are to be preferred, while iron, or tin showing iron, are to be carefully avoided, as the mordants have a great affinity for iron and ruin the color. I use a large brass kettle holding about five gallons.
Mordants
"For mordants I use Glauber salts and sulphuric acid, and with the weight of cloth I use, it takes 3 oz. of Glauber salts and 3/4 oz. of sulphuric acid (full strength) to each six yards of flannel. I use a one-ounce Phenix graduate (American standard) measuring glass, and as full strength sulphuric acid has about twice the specific gravity of water, one should measure by the scale engraved on the right-hand side of the glass. The left-hand scale is based upon the standard unit of weight, which is water.
Uses of acids