Safelight Filters

[david b]

I have several of the old Kodak screw in safelights with various red filters on them.

Two are 0C, one is 0A, and one is 6B.

I will be using Ilford multicontrast paper.

Will I have an issue using any of these lamps with a 15w bulb?

 

[Dave Miller]

A safelight test would be a good way to find out.

 

[Lopaka]

The OC filter is for the Multigrade paper. The OA is for graded papers and not safe for MG. 6B is for X-ray material.

The bulb size depends on the distance from the work area. Might be 15w, might be 7.5w. When doing initial set-up, I do a quick and dirty to see if its close. Determine the base flash to give the paper a medium gray with normal development. Pre-flash the paper, then lay some coins on it for 5 - 10 minutes and process normally. Examine carefully after fixed. Any hint of coin outline indicates safelight fogging. When you think you have it, Kodak outlines a more scientific version of the test that will provide more comfort.

Safelight filters begin to lose their effectiveness with use and age so need to be tested periodically.

Bob

 

[david b]

Thanks Bob. Much Appreciated.