Abstract
The use of sea water for washing photographic materials is practical only when a final wash of about 5 minutes in fresh water is used. This final wash removes the residual salts from the material and thus prevents (1) rapid fading of the image caused by these salts in the presence of hypo, and (2) absorption of moisture by the hygroscopic sea salts. — The removal of hypo is greatly accelerated during washing in sea water as compared with fresh water. As a result, it is recommended that films and prints be washed in sea water for about one-half of the usually recommended times and finally for about 5 minutes in fresh water. — An increase of 20° to 40°F in the temperature of sea water increases the rate of washing by 25 to 50 per cent but washing at as low a temperature as 50°F removes the hypo more rapidly than at 70° F in fresh water. — The total time involved in washing in sea water followed by fresh water is somewhat less than that required in fresh water alone.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of the Society of Motion Picture Engineers
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
