1046. In First Development

In First Development.

A.

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

10 ozs

Pyrogallic Acid.....................................

135 grs.

B.

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

9 ozs.

Liquor Ammonia (880)...............................

1 oz.

Potassium Bromide....................................

145 grs.

1047. For Reversing Image. -

C.

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

80 ozs.

Permanganate of Potash................................

70 grs.

Sulphuric Acid..........................................

6 1/2 drs.

It is advisable to add the sulphuric acid to the permanganate solution (5 minims to each ounce of solution) immediately before use.

1048. Positive Re-Developer. -

D.

Distilled Water.........................

20 ozs.

Sodium Sulphate............................................

4 1/2 drs.

Amidol..........................................................

1 1/2 drs.

1049. For Oxidation of Developer-

E.

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

50 ozs.

Acid Permanganate, C Solution .........

1 oz.

1050. For Intensification. -

F.

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

20 ozs.

Pyrogallic Acid..........................................

1 1/2 scruples

Citric Acid.................................................

1 1/2 scruples

G.

Distilled Water ........................

4 ozs.

Nitrate of Silver..............................................

1 1/2 drs.

1051. Clearing Solution. -

H.

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

40 ozs.

Permanganate of Potash...............................

1 scruple.

1052. Fixing Solution. -

I.

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

20 ozs.

Sodium Hyposulphite...................

3 ozs.

Commercial Sodium Bisulphite..........

1 oz.

Potassium meta-bisulphite, 60 grains, may be used instead of the sodium bisulphite, if the latter is not in stock.

1053. Varnish. -

J.

Pure Benzine (Crystallizable)......................

3 1/2 ozs.

Gum Dammar.............................................

300 grs.

1054. A valuable alternative varnish is made by dissolving in two ounces of amyl acetate as much thin sheet celluloid as it will take up, and using this as a stock solution, reducing it to a working consistency in a second bottle by the addition of amyl acetate. This varnish will stand the heat of the projecting lantern much better than any gum varnish.