thoroughly wet it and squeeze out excess moisture. Immerse the wool; heat 

 to boiling; boil for 30 minutes, rinse and dry. Wool previously mordanted 

 with alum will become darker brown than unmordanted wool. 



Dai-k Brown Wool : alum mordant 

 Colorfastness: good 

 1 pound wool 



1 peck dry Persian walnut hulls 

 ^6 ounce potassium dichromate 

 1^ ounce acetic acid, or 6 to 7 tablespoons vinegar 



Use alum mordant (see pages 67 to 68), then follow direction for dyeing 

 "Light Brown Wool" (above). Without rinsing the material, transfer it 

 to a boiling bath of potassium dichromate and acetic acid in 4 gallons of 

 water. Stir while it boils for 10 minutes, rinse and dry. 



A grayer and darker brown will be obtained if the fabric is boiled in 

 a bath of }i ounce of ferrous sulfate (copperas) instead of potassium dichro- 

 mate and acetic acid. 



Drab Cotton: no mordant 

 Colorfastness : fair to light, good to washing 

 1 pound cotton 

 1 peck dry Persian walnut hulls 



Follow directions for dyeing "Light Brown Wool" (above). 



Zinnia Flowers {^innia sp.) 



The zinnia flowers used in these tests were of assorted colors. 



Light Yellow Wool : alum mordant 

 Colorfastness: fair 

 1 pound wool 

 ji peck of fresh zinnia petals and flower heads 



Use alum mordant (see pages 67 to 68). Cut up the flowers, add enough 

 water to cover them, heat to boiling and boil for 10 to 15 minutes. Strain 

 out the flowers and add cold water to the dye extract to make a bath of 

 4 to 4}'2 gallons. Before immersing mordanted wool in the dyebath, thor- 

 oughly rinse it and squeeze out excess moisture. Immerse the wool; heat 

 to boiling; boil for 30 minutes, rinse and dry. 



Dark Greenish- Yellow Wool: chrome mordant 

 Colorfastness: good 

 1 pound wool 

 yi peck of fresh zinnia petals and flower heads 



Follow the directions for dyeing "Light Yellow Wool" (above). 



106 



