from The Century Dictionary and Cyclopedia
- In chem., containing the sulpho group of atoms, HSO3 or HO.SO2, twice in union with carbon: as, anthraquinone disulphonic acid, C14H6O2(HSO3)2, used in the manufacture of artificial alizarin.
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To bleach that dye out I'll have to go over his face with a needle, pore by pore, and hammer in the indigotin disulphonic.
To bleach that dye out I'll have to go over his face with a needle, pore by pore, and hammer in the Indigotin disulphonic.
The reason of this different behaviour of the mono - and disulphonic acids is mainly to be sought in their difference of solubility; the monosulphonic acids are not very soluble, and are only capable of giving solutions measuring 10° and 6° Bé, respectively, whereas the disulphonic acid yields an 18° Bé solution, in addition to which the much higher acidity of the latter quickly gelatinises the pelt.
In addition to phenolic mono - and disulphonic acids (and higher sulphonation compounds), the homologues, cresols, xylenols, and naphthols enter into reaction.
If a larger proportion of acid be used, then the indigo disulphonic acid is formed, which is fairly easily soluble in water, and gives bluer shades than the former.