A.-

Pure water

25 ounces

750 c.c.m.

Metol

60 grains

4 grams

hydroquinone

60 grains

4 grams

Cramer's Dry Sulphite Soda.

1 ounce

30 grams

B*.

-Pure water...............

25 ounces

750 c.c.m.

Cramer's Dry Carbonate Soda

1/2 ounce

15 grams

(Which will test 10 degrees by hydrometer.) For use mix equal parts A and B.

♦Solution B can be replaced by an equal quantity of diluted Acetone 1 part Cramer's (Liquid) Acetone. Water 20 parts.

Note . - With fresh developer it may be necessary to add to each ounce I drop of a 1 to 10 solution of bromide of potassium, to make it work clear. This developer should not be used too old or too dilute or it is liable to produce peculiar streaks and blotches.

581. Hydroquinone - Eikonogen Developer.

A.-

Pure water

60 ounces

1800 c.c.m.

Eikonogen

1 ounce

30 grams

Hydroquinone

1/2 ounce

15 grams

Cramer's Dry Sulphite Soda.

2 ounces

60 grams

B*

. Pure water.................

60 ounces

1800 c.c.m.

Cramer's Dry Carbonate Soda

5 ounces

150 grams

(Which will test 40 degrees by hydrometer.)

For use take: A 3 parts. B* 1 part.

* Solution B can be replaced by a mixture of Cramer's (Liquid) Acetone 1 part, water 10 parts. A few drops of a 1 to 10 solution of Bromide of Potassium should be added if the developer is quite fresh to make it work clear. Combinations of Eikonogen and Hydroquinone should not be used too old or too dilute as they are liable to produce peculiar streaks and blotches on the negative.

582.

Pyro - Metol Developer.

A.-

-Pure water.................

30 ounces

600 c.c.m.

Metol.......................

1 ounce

20 grams

Oxalic Acid.................

24 grains

1 gram

Pyrogallic Acid

1/2 ounce

10 grams

B.-

-Pure water.................

30 ounces

600 c.c.m.

Cramer's Dry Carbonate Soda

4 ounces

80 grams

(Which will test 64 degrees by hydrometer.)

C-

-Pure water.................

30 ounces

600 c.c.m.

Cramer's Dry Carbonate Soda

4 ounces

80 grams

(Which will test 64 degrees by hydrometer.)

For use take:

1/2 ounce A ...........

10 c.c.m.

1/2 ounce B...........

10 c.c.m.

1/2 ounce C...........

10 c.c.m.

10 to 15 ounces water. .

. 200 to 300 c.c.m.

According to intensity desired.

A, B and C may be mixed together and keep well in one solution which should be diluted for use with from 6 to 10 parts of water.

583.

Pyro - Metol with Acetone.

Substitute for B and C the following:

Pure water................

. 60 ounces 1200 c.c.m.

Cramer's Dry Sulphite Soda

6 ounces 120 grams

Cramer's Liquid Acetone. ..

6 ounces 120 c.c.m.

For use take:

1/2 ounce A .......

15 c.c.m.

1 ounce B.......

30 c.c.m.

10 ounces water.. ..

300 c.c.m.

584.

Developer for Transparencies.

(Lantern Slides.)

Hydroquinone and Pyrocatechin.

A.-

-Pure water.................

32 ounces

960 c.c.m.

Cramer's Dry Sulphite Soda.

6 ounces

180 grams

Pyrocatechin................

240 grains

16 grams

Hydroquinone...............

240 grains

16 grams

Bromide of Potassium.......

120 grains

8 grams

B.-

-Water......................

32 ounces

960 c.c.m.

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

240 grains

16 grams

For use mix equal parts A and B.

Solution B can be replaced by:

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

20 ounces

600 c.c.m.

Cramer's (Liquid) Acetone. .

12 ounces

360 c.c.m.

585-

Contrast Developer. For developing over-exposed plates.

Also useful as an addition to normal developer in case it does not work with sufficient brilliancy for which purpose the addition of a few drops per ounce is sufficient.

Pure water

30 ounces

1500 c.c.m.

Cramer's Dry Sulphite Soda.

1 ounce

50 grams

(Which will test 16 degrees by hydrometer.)

Edinol, Glycin or Hydroquinone 100 grains 10 grams

Bromide of Potassium.......

.. 20 grains

2 grams

Carbonate of Potassium.....

1/2 ounce

25 grams

Use full strength. This solution can be used repeatedly. As soon as a plate shows over-exposure in the normal developer rinse and place in the dish containing the contrast developer and develop until sufficiently intense.

586.

Developer for Line Work. (Black and White.)

Pure water

30 ounces

900 c.c.m.

Cramer's Dry Sulphite Soda.

2 ounces

60 grams

(Which will test 32 degrees by hydrometer.)

Edinol, Glycin or Hydroquinone

: 150 grains

10 grams

Bromide of Potassium.........

100 grains

7 grams

Carbonate of Potassium.......

2 1/2 ounces

75 grams

(Use full strength.)

This developer with Cramer Contrast Plates produces negatives of great intensity and absolute clearness, desirable for copies of pencil sketches, pen drawings, line work, etc.

587.

Developers for X - Ray Plates.

Eikonogen - Hydroquinone Developer.

A.-

-Pure hot water.............

30 ounces

900 c.c.m.

Eikonogen..................

1/4 ounce

7 grams

Hydroquinone............

,1/2 ounce

15 grams

Cramer's Dry Sulphite Soda.

1 ounce

30 grams

Bromide of Potassium......

15 grains

1 gram

B.-

-Water.....................

10 ounces

300 c.c.m.

Cramer's Dry Sulphite Soda.

1 ounce

30 grams

For use take:

6 ounces A ......

..... 150 c.c.m.

2 ounces B.......

..... 50 c.c.m.

A and B can be mixed together and used as one solution.

588.