To Distinguish a Woodcut, or Line Process Block
In a block the lines of the design are indented slightly into the paper, which shows itself on the back of the print (unless thoroughly rolled out under heavy pressure). Close observation with the magnifying glass will show the edges of the lines to be slightly rough—by the ink from the face of the line being squeezed over the edge; in good printing this is not so apparent. A weakness with nearly all process blocks is that the edges of fine tints and outlying fine lines are apt to print heavier than they should, unless very carefully worked.