self masking and POP

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From: Christina Z. Anderson (zphoto@montana.net)
Date: 01/30/03-11:04:17 PM Z

I've come across a couple books that conflict on self masking. One book
says cyanotype is not self masking because the purple/blue/grey color does
not hold back actinic light and shadows block up, but that VDB, platinum,
and palladium are all self masking (Van Keuren). Another book says
kallitypes and VDB are not self masking but salt is, and hence shadows don't
get as deep (Crawford). Another says VDB is not self masking, too (James).
Who is correct? I think all people agree that platinum is self masking, but
how about:
palladium
kallitype
brownprint
van dyke
cyanotype
salt?
And furthermore, which of these are POP? Cyano, VDB, salt??
Chris

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