ive got a problem regarding my developing contact sheets and i dont think its opperator error now that i tried a few tests.the contacts came out very gray with no true black.i exposed paper alone(as a test) for 2secs intrvals and 30 sec intervals up to 1min 30 secs and the paper comes out gray .i believe ive got the chemicals down regards to mix ,temp and time but still this gray result and no black..any help ? please and thanks ,,declan