Is it permissible to venerate a black-and-white drawing of an icon, or is it necessary that the icon (or icon print) be in color?
Or perhaps another way to ask is, to be an icon, must an image be multicolored or may it be in only one color?
Good question, TC. Being that it is still an icon per se, there's probably nothing wrong with venerating a 'black-and-white' drawing. Afterall, it's not the paint and wood that's being venerated in a traditional written icon. However, there is a whole theology that goes into writing an icon; with many special prayers having been said during the writing (Orthodox for 'painting'), and chances are, it's been blessed. But- this is only my personal feeling and I could be way wrong. Just my $0.02