Quote Originally Posted by badler View Post
I’ll do some more work. The formula is correct. The safe light is a red led so good there.
Don't be too sure about the red LED. When I started wet plate work three+ years ago, I bought a couple of red LED bulbs for the darkroom and they were great - for a while. Turns out these were white LEDs with a red coating on the shell of the bulb which faded over a period of months. They started leaking orange and yellow light which fogged my work more and more. It took a while to figure out what the culprit was, because I assumed the LEDs were not the problem.
If its an actual red light LED, you're safe. But watch out for those color-coated bulbs.