This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.

A.- | Pure water | 25 ounces | 750 c.c.m. |

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.

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