I. Light yellow is comparatively very little in demand for ostrich
feathers, and scarcely used for trimming hats of children and young
misses as a set-off for other colors. To produce it, prepare a pretty
hot bath with a little sulphuric acid, so as to give it a slightly
acid taste, add very little quinoline yellow, lay down the feathers in
the bath for one-half hour, turning and agitating them from time to
time, lift, rinse and dry. For this color, as well as for light blues
and roses, the feathers must be perfectly white. (For this dye the
quinoline yellow manufactured by the Actien Gesellschaft fuer Anilin
Fabrikation, Berlin, is specially suitable). As the purity of all light
shades of delicate colors greatly depends upon the purity of the water,
it is advisable to bring the bath, before preparing it, to boil with
some bran and chloride of tin and skim it off well.