I have Hansa HC-2000 dichroic color enlarger with 100W bulb and Kodak Polycntrast filters. Though, the enlarger has colorhead with dichroic filters, I tried to test for relative ISO Range numbers with gelatine polycontrast filters. The test procedure has been as descibed in Steve Anchell's Variable Contrast Printing Manual using Stauffer 21-step density tablet in the negative carrier. I use Ilfod MG glossy papers.Though, the procedure recommends starting point of f/8 at 10 seconds, I could get three white steps at f/4 and 100 seconds with -1 filter and with this setting the the last three steps do not become maximum black as required, they continue to be dark greys. So what is wrong- my testing procedure or the equipment ? I shall appreciate your help. Hansraj.