Quote:
Originally Posted by Dave
Dialling in about 30 units of Cyan is the cheapest method but I must admit that is an approximate number and maybe someone else can offer something more exact.
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Depends on the enlarger make. And contrary to the accumualated wisdom of the web, Cyan does have an effect on contrast albeit small. The wavelength range it transmits and VC paper wavelength sensitivity do seem to overlap a bit. But having said that you can compensate with yellow and/or magenta.
More importantly the filter factor for a 130 units of yellow on an L1200 is a mere X1.2 and for a 130 units of magenta is only X2.15 (these are time factors not densities) so at the most you would get a single stop but I rekon it would be somewhere between those so probably only around a half stop which isn't much at all.