I'm having problems obtaining enough contrast in my prints lately. Among a number of potential causes (film age, etc...) I'd like to eliminate the aging of Multigrade filters, thet I've had for 30+ years. I'm aware of mentions of filters fading, but like all things on the web, I prefer to check from actual witnesses. This is a picture of filters 0-5, taken against a backlit piece of white paper, with custom white balance made on the background white. First question. Do the #4 and #5 filters look right, compared with those you have? Second question. Shouldn't the hardest filter be deep magenta, from green being blocked, blue transmitted for the corresponding layer, and red transmitted to allow the enlager's red filter to do its job? Third question. Turning suspicion to my D-72 mixed from base chemicals. I see an induction time of ~40s. This seems a bit long. I do have "real" Dektol powder at hand, but don't want to send 2 liters of developer down the drain without at least plausible motive. Thank you for your attention.