Celluloid Varnish

Celluloid....................................

14 grs.

Amyl Alcohol...........................

1 oz.

Acetone....................................

1 oz.

Use cold

Dead Black for Brass. A good dead black for brass work, interiors of lens mounts, etc., can be made by mixing 24 grs. of lamp-black on a plate with about 35 drops of gold size.

Films, Varnish for

Benzole............................

4 ozs.

Gum Damar.......................

100 grs.

The varnish should be filtered before use. It may be applied either by pouring on the film, brushing on with a camel's-hair brush, or by immersing the film in the varnish and then hanging it up to dry.

Machinery, Paint for Dulling Bright Surfaces. (See Machinery, Photographing.)

Negative Varnish

Cold

Benzine................................

3 1/2 ozs.

Acetone.............................

3 1/2 ozs.

Absolute Alcohol.............

1 3/4 ozs.

Gum Sandarac...................

6 1/2 drs.

Slightly warm the solvents in a water bath, while dissolving the gum sandarac. Filter and then place in a bottle, which should be carefully stoppered. A similar form of cold varnish may be made by dissolving 1/2 ounce of gum sandarac in 3 ounces of chloroform. Shake until dissolved, then filter.

Negative Varnish

Hot

Absolute Alcohol.........................

15 ozs.

Castor Oil....................................

1/2 dr.

Shellac.........................................

13 drs.

Gum Sandarac..............................

3 drs.

Gum Mastic..................................

20 grs.

Dissolve and filter. The negative should be slightly warmed and the varnish applied while hot.

Removing Varnish

Alcohol.......................

5 ozs.

Water.......................

5 ozs.

Caustic Potash...........

1/2 oz.

Place the negative in a dish and pour on the solution, gently rocking until the varnish is dissolved. When using either of the above methods the plate should be well washed after the operation.