Title and statement of responsibility area
Eastman Permanent Crystal Pyro
General material designation
Other title information
Title statements of responsibility
Level of description
Edition statement of responsibility
Class of material specific details area
Statement of scale (cartographic)
Statement of projection (cartographic)
Statement of coordinates (cartographic)
Statement of scale (architectural)
Issuing jurisdiction and denomination (philatelic)
Dates of creation area
[ca. 1909] (Manufacturing)
- Eastman Kodak Company
Physical description area
1 bottle of photographic chemicals : developing agent
Publisher's series area
Title proper of publisher's series
Parallel titles of publisher's series
Other title information of publisher's series
Statement of responsibility relating to publisher's series
Numbering within publisher's series
Note on publisher's series
Archival description area
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.
Immediate source of acquisition
Donated to Ryerson University Library and Archives Special Collections department by Howard & Carole Tanenbaum.
Language of material
Script of material
Location of originals
Availability of other formats
Restrictions on access
Open. Records are available for consultation without restriction.
Terms governing use, reproduction, and publication
Contained in an embossed translucent brown bottle with 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.