Brief General Instruction

325. Introduction

Introduction. Collodio Carbon is a matte surface collodion emulsion paper coated on extra heavy stock, and prints on this paper, toned either black or sepia, closely resemble genuine carbon prints. With proper manipulation soft and artistic effects can be secured. The preceding instruction on the manipulation of Aristo Platino and matte papers generally, will assist very materially in enabling you to secure the best results from the very first. As the collodion emulsion of collodio carbon paper is coated on extra heavy stock, it is necessary that the instruction for the different manipulations be carefully followed. In fact, collodio carbon paper, in order that absolutely permanent prints be secured, must receive thorough washing in the preliminary waters, subsequent washings between the toning baths and also in the final washing after fixing. The necessity of cleanliness and carefulness in the use of the different trays can not be too strongly impressed upon those who use this class of paper.

326. Collodio carbon paper being of heavy stock, prints made on it will look better when a liberal margin surrounds the picture - the margin serving as a mount. This margin is obtained by masking the negative and using a large printing frame suitable to the size of the mask. This paper printed with a margin lends itself to beautiful effects in nicely posed subjects, small heads or odd effects, and it is especially effective for landscape work. (Full dins rections regarding the masking of the negative are given in the following chapter " Detailed Instruction").

327. Printing

Printing. Collodio carbon paper will print at about the same speed as the platino papers, but must be printed deep for rich results.

328. Washing Prints

Washing Prints. As this paper is very heavy-it will require more preliminary washing to remove the preserving chemicals and free silver than is necessary with the ordinary light weight papers. At least eight changes of water should be used, handling the prints over in each. Leaving the prints in running water for half an hour without handling will not do. It is not as effective and some of the prints will not be thoroughly washed. After washing, tone in the following gold bath:

329. Gold Bath

Gold Bath.

Stock Solution No. 1

Chloride of Gold.............................

15 grs.

Pure Water..............................................

15 ozs.

Place the chloride of gold in a 16 oz. bottle and add 15 ozs. pure water. Shake well until the gold is entirely dissolved.

330. Acetate Stock Solution No. 2

Acetate Soda.........................

4 ozs.

Pure Water.........................................

10 ozs.

Dissolve this chemical thoroughly by shaking the bottle. Label this bottle " Acetate Stock Solution No. 2."

Borax Crystals....................................

2 ozs.

Hot Water.....................................

4 ozs.

As borax crystals do not dissolve freely, it is advisable to use hot water for dissolving this chemical. Label the bottle "Borax Stock Solution No. 3."