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قراءة كتاب The Practical Ostrich Feather Dyer
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be a rich and permanent cream. Should a pink or brownish tint be required to match sample, a drop of Bismarck brown added to bath will produce the desired result; or if wanted a little more yellow, a few grains of turmeric added to the bath will answer.
SILVER GRAY.
A very delicate color, requiring feathers almost a pure white to make a clear shade. After thoroughly washing and rinsing, or bleaching if required, with permanganate of potash, prepare a bath of one gallon of luke warm water, and add a small handful of starch. Enter feathers and manipulate between the hands; then add to bath a small piece of copperas, about the size of a pea, and a few drops of diluted logwood liquor; re-enter feathers and let remain in bath until in appearances they are two or three shades darker than sample; then add to bath a couple of drops of diluted violet, first removing feathers from bath; let them remain in a few seconds longer, and squeeze out and dry in the usual way. The violet gives your feathers the brilliant shade that is so desirable in silver grays.
Be careful in drying them not to use starch that has been previously used in drying feathers that have been dyed in acid baths, as it would be liable to spot your color. Should you, through carelessness or otherwise, allow your color to get darker than shade desired, rinse feathers off a couple of times in cold water to remove starch; then dilute half a teaspoonful of oxalic acid in a gallon of hot water, and pass feathers through it for a few seconds, and then rinse off twice in boiling water. After which prepare a bath same as per recipe, using more care, and pass feathers through until you have obtained the desired shade.
BISMARCK BROWN.
Wash and rinse your feathers, after which prepare a bath of one gallon of boiling water and about one ounce of turmeric and half an ounce of copperas; enter your feathers and let them remain in bath about two minutes, more or less, after which take out and rinse twice in cold water. Meantime have boiling a bath of half a pound of logwood to a gallon of water, and enter feathers at boiling temperature, letting them remain in about ten seconds or longer. Should a darker shade be desired, take out and rinse in cold water, after which dilute a half teaspoonful of aniline brown in a gallon of boiling water. Reduce temperature a little with cold water. Enter feathers and let them remain in about three minutes; then cool off a small portion of the bath, and add a small handful of starch, pass feathers through and dry.
If a lighter shade is wanted, add a drop of sulphuric acid to the starch bath and pass feathers through. If the sample to match be more on the yellow order, about twice the amount of turmeric in the first bath; and if desired more on the red, use no turmeric, only copperas, in the first bath. If a darker shade is wanted, let them remain a longer time than that specified in the logwood bath. Any light color can be used to make a Bismarck brown; but if very dark colors are used, it is well to draw off some of the color, doing it in the usual way.