Hydroquinone 75 grains Development complete in from 2 to 5 minutes.
The tannage may also be effected by exposing pelt saturated with hydroquinoneto oxidation by the air.
If impure hydroquinone is used, a black, sticky precipitate will usually appear after the addition of the sulfuric acid to the hydroquinone solution.
This solution is then added gradually to the hydroquinone solution, with the use of a mechanical stirrer (see notes), the mixture being cooled so that the temperature never rises above 30'0.
However, the oxidation of hydroquinone is more rapid and convenient and, hence is more desirable for use in the laboratory.
Hydroquinone was obtained by Caventou and Pelletier by heating quinic acid, but these chemists did not recognize its true nature.
This placed the production of quinone on a manufacturing basis, so that when a demand for hydroquinone sprung up, the wants of the photographer were met by the technologist.
Now hydroquinonewhen dissolved in alkali also acts as a reducing agent, and in this we have the first application of a true coal-tar product as a photographic developer.
Expose under magnesium light and develop with a citrate oxalic developer, or in the following hydroquinone developer: Hydroquinone .
Defn: A green crystalline substance formed by the union of quinone with hydroquinone, or as an intermediate product in the oxidation of hydroquinone or the reduction of quinone.
He was a fine-looking young fellow, tall and strong, and debonair, but his face was already beginning to show traces of the wild and reckless life which he was leading.
Many a time when I was little, had I had a ride on White Charlie, and I needed no help to scramble up to my old place on the big horse's neck.
One trooper, kinder than the rest, took my pony's rein as I slid off its back and ran to him.
Somehow she did not believe that Lady Katherine was really dead, and she determined to do a very cruel thing to find out the truth.
And seest thou that bonnie, bonnie road, that winds up round the ferny brae?
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "hydroquinone" in a variety of sentences. We hope that you will now be able to make sentences using this word.
