Zinc |
Aluminium |
Darker surface colour, somewhat detrimental for close-valued tonal drawing. Crayon and wash drawings appear markedly different from those on stone |
Lighter surface colour, easier to see the drawing of close tonal work. Crayon and wash drawing appear more nearly like those on stone. |
"Peau de crapaud" wash techniques possible |
"Peau de crapaud" wash techniques not possible |
Inherently sensitive to grease. |
Inherently less sensitive to grease |
Inherently less sensitive to water |
Inherently very sensitive to water |
Produces strong image areas |
Produces moderately strong image areas |
Produces less firm non-image areas |
Produces excellent non-image areas |
Easy to stabilize added work after counteretching |
Somewhat difficult to stabilize added work after counteretching |
Prone to scumming when printing, unless effectively desentitized |
Resistant to scumming when printing |
Moderately difficult to stabilize deleted work after processing |
Moderately easy to stabilize deleted work after processing |
Oxide films jeopardize effective desensitization |
Oxide films jeopardize effective desensitization |