I have a DUKA safelight and while the Colorstar Analyser is extremely sensitive to extraneous light from a safelight I can have the DUKA quite bright and it passes the Colorstar test which is to take flitration and exposure readings with the safelight covered and do the same when uncovered and check to see that nothing changes.

Well at the level I use my DUKA nothing does. I was about to assume that the safelight level I use was therefore OK from a fogging aspect but this may be an unwarranted assumption.

So what is a correct test for RA4 paper?