I'm new to printing and the problem I'm having is that when I try to print a neg ative, the enlarging paper turns black. Doesn't matter if I use one second or 2 5, I can't get a test print. I'm using an old C700 Super Chromega 6x7 Dichroic enlarger. I expose the paper (Adorama pearl) and put it into the developer (Dek tol 2:1) and within seconds it turns black. What am I doing wrong?