>I have never understood the hooha about no metal, since I have never yet
>heard of a platinum printer immersing a brush in platinum emulsion up to
>the ferrule, unless the mere proximity of metal to the emulsion has a
>voodoo effect -- which is certainly possible.
The hooha (my spell checker choked on this one) probably has to do with the
fact that the metal will cause platinum or palladium to plate out, thus
losing valuble printing material. This is even problematic as it takes heat
and some period of time to plate out. I have some tests run by Phil "Beyond
the Zone System" Davis in which he coated a piece of paper with a rusty
nail and got a decent dMax. I've used a flat sable brush with a metal
ferrule with no ill effects.
Dick Sullivan
Bostick & Sullivan
1541 Center Dr.
Santa Fe, New Mexico
87505