The whole operation should be carried out in a subdued light, as too strong a light would render insoluble the film of bichromated albumen.
It only remains to clear off the bichromated sugary coating which forms the reserve, and which, being hardened by the heat, resists ordinary washing.
In proportion to the graduated density of the negative, the light acts more or less on the bichromated gelatine, rendering the latter, in proportion, insoluble and hardening it.
The action of the light on the bichromated gelatine forms the basis of this process.
At any rate, every photographer knows that bichromated gelatine is much more rapid than the chloride of silver he generally has to do with.
We now come to the second stage of the process, the application of a film of bichromated gelatine to the plate.
The plate is slightly warmed upon a slate slab, underneath which is a water bath; it is then flooded with the above mixture of bichromated gelatine, leaving only sufficient to make a very thin film.
This bichromated gelatine requires also only a very small amount of re-damping, reproduces faithfully the character of the negative, and the jelly can be used even after a period of four days.
The Production of Grain= in Collotype plates takes place in the last instant of drying the plates in the drying-cupboard; it depends entirely upon the larger or smaller quantity, and the consistency of the bichromated gelatine used.
In collotype a bichromated albumen substratum is still used by many operators, this coating when dry being exposed through the glass plate, the latter placed coated side downwards upon a flat black support, preferably of velvet.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bichromated" in a variety of sentences. We hope that you will now be able to make sentences using this word.
