Item 2005.005.6.006 - Eastman Permanent Crystal Pyro

Title and statement of responsibility area

Title proper

Eastman Permanent Crystal Pyro

General material designation

  • Object

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Statement of scale (cartographic)

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Dates of creation area


  • [ca. 1909] (Manufacturing)
    Eastman Kodak Company

Physical description area

Physical description

1 bottle of photographic chemicals : developing agent

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Custodial history

Scope and content

Item is a half pound bottle of Eastman Permanent Crystal Pyro, the "superior form of pyrogallic acid." This form of developing agent was very popular in the 1800s to 1920s.

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Physical condition

Immediate source of acquisition

Donated to Ryerson University Library and Archives Special Collections department by Howard & Carole Tanenbaum.


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Open. Records are available for consultation without restriction.

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General note

Contained in an embossed translucent brown bottle with original label.

Signatures note

Original label:
Half Pound Eastman Permanent Crystal Pyro
Eastman Kodak Co., Rochester, N.Y. U.S.A.
Trade Marks Reg. U. S. Pat. Off.
A Superior form of pyrogallic Acid
Tested EKC Chemicals for photographic purposes
No Pyro Dust [unclear] Your Dark Room 230612
Pyro Tank and Tray developer Formula
For TANK DEVELOPMENT, take 5 1/2 ozs, each of A, B and C and add water to make 1 gallon, or take 1 volume of 1, B and C and add 25 volumes of water. Develop about [unclear]2 minutes at 65 degrees F.
For 5x7 Plate Tank, use 2 1/4 ozs. each of A, B and C and add 58 oz. of water. Develop about 15 minutes at 65 degrees F.
For TRAY DEVELOPMENT, take 1 oz. each of A, B and C and add 7 ozs. of water. Develop about 7 to 9 minutes at 65 degrees F.The time of development will vary according to the subject photographed and the degree of contrast required in the negatives.

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