in outdoor advertising, a production flaw that allows the previously posted sign to show through the current message; may result from the type and quality of paper used or from excessive rainwater. See coat-out.

When an adhesive or colorant goes through and becomes visible and/or tacky on the reverse surface of the paper or substrate to which it was applied. It is difficult to test for this characteristic because the results are dependent on such variables as thickness of the paper or substrate and the amount adhesive or colorant applied.

Bleeding – A reaction in the stain or dye that causes the colour to wick into subsequent coating applications.