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The Barnet Book of Photography A Collection of Practical Articles

Remembering that the film is mainly gelatine


Inasmuch

as it will be seen that the print is not on paper, but consists of a transferable film of pigmented gelatine, it will be understood that the paper employed is merely a support to that film, hence it is customary to speak of the paper as the support, whilst moreover it maybe, and as often as not is ivory, glass, textile fabrics, wood, or other substances.

If now we wish to again transfer the film so as to correct the lateral reversal, we substitute for the single transfer paper a "_temporary_ support."

The temporary support which is to receive the film merely whilst it is being developed, and with the intention of its being subsequently transferred again to a _final_ support, may be paper or many other things.

Moreover, remembering that the film is mainly gelatine, it should be clear that whatever the nature of the surface of the temporary support, the soft glutinous film will take that surface just as we may make the impression of a seal in sealing-wax.

The normal carbon print is shiny, due to the gelatine, and so, if as a temporary support we were to use ground glass or matt "opal," the carbon print film would receive the fine granulated surface and give a matted print as a result. This merely by the way as suggesting an additional advantage offered by the double transfer process as a set-off against the slight extra trouble.

justify;">If double transfer is determined upon, and it is not intended to experiment with ground glass, etc., then when purchasing the carbon tissue, some _temporary_ support (sheets of paper coated with gelatine and shellac) should be procured, also some pieces of _final_ support.

Whatever the temporary support, it must receive an application of waxing solution. This also may be bought, or can be made of:--

Yellow resin 36 grains. Yellow wax 12 " Ether 2 ounces.

Melt the wax, add the resin, stir together and then add the ether.

Pour a little of this mixture on to the temporary support and spread with a tuft of cotton wool, and rub over to make it even.

The final support for double transfer may be purchased, and is made ready for use by soaking for ten minutes in alum.

The temporary support, after being waxed and the waxing solution having become dry, is to take the place of the single transfer paper in every respect, and the film developed as already described. When it has reached the final washing, after the alum clearing bath, it is brought into contact with the final support (which has been for ten minutes in alum bath as just described) and is removed to the glass or zinc plate and squeegeed.

It is now hung up to dry, and when quite dry the blade of a knife should be inserted at one corner and the temporary support gently pulled off.

Such is the carbon process, neither difficult nor lengthy, and with this brief outline to form an introduction, the reader who is a tyro will the better appreciate the fuller description which follows.


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