from The Century Dictionary.
- noun A salt of hyposulphuric acid, H2S2O6, now called
dithionic acid; dithionate.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Chem.) A salt of hyposulphuric acid.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun chemistry A
saltof hyposulphuric acid.
Sorry, no etymologies found.
-- A blue bottle containing 160 grammes of a clear fluid with a slight black deposit, consisting of a mixture of equal parts of a 14 per cent. solution of sodic hyposulphate, and a 4 per cent. solution of lead acetate.
The water was so warm that the gelatine frilled in spite of alum, and what was worse, when I put the negatives in the hyposulphate of soda they ran off their supports like so much hot starch.
Dissolve four ounces of hyposulphate of soda in one gallon of water and add corn meal to make a heavy dough, and give an ordinary feed of this twice a day for six days, and then once a week through the summer months.
I attribute the fading to the hyposulphate not being got rid of; and the question is, Can the picture he restored?
By using, however, instead of the iodide of potassium, a weak solution of ammonia, as recommended by Mr. Hunt, a less degree of intensity may be produced again a less intensity by hyposulphate of soda and a less degree again, but still a slight darkening, by pouring on the bichloride and pouring it off at once before the whitening commences.