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Book of Formulas


Book of Formulas


Product Description

Book of Formulas
for Eastman Professional Films and Plates

These Formulas supersede all others published in direction sheets and instruction books to date, relating to Eastman Professional Films and Plates and Wratten and Wainwright Plates. We recommend them to you, confident that they will secure for you the finest results possible with products of our manufacture.

Photography is so essentially a chemical process, involving the most delicate reactions of chemicals in solution, that the chemical materials used in photographic processes must have—in the greatest degree—purity, strength and uniformity. That is Why we make and recommend Eastman Tested Chemicals.

Eastman Tested Soda!

THE sodas are the controlling and balancing factors in a developer, and to compound a developing formula correctly it is necessary to use sodas of the same strength and purity as those used in the laboratory where the formula is fitted to the materials for which it is recommended.

Eastman formulas are based on the use of Eastman Tested Sodas—desiccated carbonate 98-1/2% and desiccated sulphite 96-1/2% pure. These formulas have been found by long experience to produce negatives of excellent quality. E. K. Co. Tested Sodas are specified in all our formulas because their strength is uniform—their use protects your results. If monohydrated sodium eoroomzte is used, the quantities of carbonate given in the following formulas must be increased about one sixth.

Be Sure to Use Pure Chemicals

To get the best negatives from your films and plates—to get the best prints and enlargements from your negatives—it is imperative that the chemicals which you use be absolutely pure.

For all our films, plates and papers we furnish powders and solutions mixed in just the proper proportions and compounded from the purest chemicals, rigidly tested in our own laboratories.

But we go even further than this. For those who prefer to mix their own solutions by formulas, we have prepared a line of carefully tested standard photographic chemicals.

Don’t mar good films and plates and good paper with inferior chemicals.

This seal stands for the highest purity. Be sure it’s on the package before purchasing.

July, 1933 ROCHESTER, N. Y.

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