Hello Steffen,
I’ll quote from our
website:
And this is how you check whether you have the right light: Take a small piece of the new photographic paper to be tested out of the packaging and place a coin on it at a specific spot. Then, without letting the coin slip (hold it in place with your thumb), slowly move the sheet around the room wherever the paper would normally pass during processing.
Carry this out for about 4 minutes. Then (very important): switch off all the lights and, in complete darkness, develop the scrap, fix it, rinse it briefly, dry it and examine it under bright white light.
If you see a bright spot where the coin was placed, then the ambient light has fogged the residue of the paper and the paper CANNOT be used under this light.
Please also bear in mind that exposure accumulates and that certain latent thresholds exist. Paper that is only slightly greyed in this test may, under certain circumstances, become heavily overexposed once a basic exposure has taken place via the enlarger and the stray light is added on top.
If you want to be sure, there’s no getting round doing a test. In principle, MCC is safe for orange.
Good luck,
Mirko
