Huntington, Harwood, 1861-1923, Metz, Herman A., 1867- · New York : [s.n.] · leaf 238
e tested by putting a drop on filter paper and immediately alongside a drop of phenolphthaleine solution (y, to 1000, 60 per cent, alcohol). The contact should show at once or at the latest after one or two seconds a weak violet c-olor. If a longer time is required, some sodium sulphide should be… … DTE-BATH. RINSE-BOX. The feeding liquor is made up in the same proportion but with a small quantity of cold water in the tank. This half filled with water, the sodium sulphide and dyestufT added, after 14 hour when the solution is perfect, the bisulphite is added while stirring during another ^j…
Dyes and dyeing
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