This chroming thoroughly fixes the colour on the cotton and it will not change while being finished, either by crabbing, steaming or hot pressing.
The processes preparatory to chroming are very important, as it is essential to get the maximum yield of pelt.
After chroming them, neutralisation of the acid chrome salts is effected with borax, and the leather is ready for dressing.
In the case of goods from acid chroming baths, the amount of acid used in the reducing bath is an inverse function of the excess of acid in the first bath, e.
In chroming with baths of the acid or neutral type, the percentage of hypo should be about three times the percentage of dichromate used.
They may also be tanned without depickling if the composition of the pickle be allowed for in the first chroming liquor.
In another process the "acid" type of chroming bath is used.
In baths of the Schultz and neutral type it is better to add some acid to the hypo bath before adding the goods, but this is less essential for goods from an acid chroming bath.
The quantity varies with the rate and mode of addition, the class of goods under treatment, and the composition of the chroming bath.
A few words on the special peculiarities of the leather formed by chroming will not be out of place at this stage.
It may also be placed direct in the chroming bath, but the amount of acid thus added with the goods must be determined and allowed for when making up the bath.
If therefore such quantities be used we have the so-called "Neutral type" of chroming bath.
The chroming operation is carried out usually in drums or paddles.
The analytical investigation and control of chroming baths is usually simple.
In the latter case the acid chroming bath is preferred, using 6 per cent.
By coupling, chroming or developing, the direct blacks can be made to give full, deep and fast blacks, and examples of their use in this manner will be found in following sections.
They may be topped with aniline black, indigo, basic dyes, or combined with such direct dyes as produce shades fast to chroming to form a very great range of shades which have the merit of fastness.
Lift, rinse well, then pass into a chroming bath, made from 5 lb.
The hide powder must not swell in chroming to such an extent as to render difficult the necessary squeezing to 70-75 per cent.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "chroming" in a variety of sentences. We hope that you will now be able to make sentences using this word.
