The Year-book for Colorists and Dyers, Volume 81906 - Dyes and dyeing |
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Page 26
To determine whether an acid is stronger than 78 per cent . ( the maximum specific gravity ) some water is added ; if the specific gravity rises it is stronger , if it falls it is weaker than 78 per cent . acid .
To determine whether an acid is stronger than 78 per cent . ( the maximum specific gravity ) some water is added ; if the specific gravity rises it is stronger , if it falls it is weaker than 78 per cent . acid .
Page 49
This method consisted in reducing the dyestuff with zinc dust , and reoxidation by air and chromic acid . Whilst nitro , nitroso , and azo compounds were completely destroyed on reduction , those dyestuffs which may be regarded as ...
This method consisted in reducing the dyestuff with zinc dust , and reoxidation by air and chromic acid . Whilst nitro , nitroso , and azo compounds were completely destroyed on reduction , those dyestuffs which may be regarded as ...
Page 51
DILUTE ACETIC ACID ( 5 % ) . 5 c.c. glacial acetic acid . 95 c.c. water . DILUTE ALCOHOL ( 1 : 1 ) . 50 c.c. strong alcohol or methylated spirit . 50 c.c. water . DILUTE HYDROCHLORIC ACID ( 1:10 ) . 10 c.c. conc . hydrochloric acid .
DILUTE ACETIC ACID ( 5 % ) . 5 c.c. glacial acetic acid . 95 c.c. water . DILUTE ALCOHOL ( 1 : 1 ) . 50 c.c. strong alcohol or methylated spirit . 50 c.c. water . DILUTE HYDROCHLORIC ACID ( 1:10 ) . 10 c.c. conc . hydrochloric acid .
Page 52
This solution , which is slightly alkaline , is employed in most In a few other cases , however , in which the reduction is more sluggish ( e.g. , azo yellows ) , it has been found necessary to employ a slightly acid solution .
This solution , which is slightly alkaline , is employed in most In a few other cases , however , in which the reduction is more sluggish ( e.g. , azo yellows ) , it has been found necessary to employ a slightly acid solution .
Page 55
Boil twice for one minute with 5 per cent . acetic acid . A. Much color is stripped - Basic dyestuff . Boil with hydrosulphite B. X. Decolorized . Color is not restored by air or by persul . phate . Azo Group No.
Boil twice for one minute with 5 per cent . acetic acid . A. Much color is stripped - Basic dyestuff . Boil with hydrosulphite B. X. Decolorized . Color is not restored by air or by persul . phate . Azo Group No.
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Common terms and phrases
acetic acid action added addition Agent or Name Alizarine alkali ammonia Anilin Anthracene apparatus assignor bath Black Blue body Boil Brilliant Brown carbonate CD CD CD cent chlorid Chrome color coloring-matters combination compounds conc consists containing cotton crystals Cyanine Dark dated Diamine Direct DISCHARGE dissolved Dye Method dyed dyestuff employed extra fabric Fast fibre Germany Green heated hydrosulphite Indigo invention relates Lakes machine Maker manufacture material Math WGS means Methyl mixed mixture mordant Mz WGS Name of Dye obtained Orange oxidizing paste Patent PK WGS pounds powder preferably prepared present printing quantity reaction reducing salts Scarlet shades soap soda sodium soluble solution Specific Gravity steam suitable Sulphur sulphuric acid temperature Thiogene treated Violet washing WCh WCh WGS WGS WGSCh wool Yellow yield York