acid test assay black and white blank determination brouillon cartoon charcoal charcoal drawing chiaroscuro crayon criterion crucial test crucible delineation design determination diagram docimasy doodle draft drawing ebauche esquisse essay feeling out first draft graph kiteflying line drawing ordeal pastel pen-and-ink pencil drawing probation proof rough copy rough outline rough sketch silhouette silver-print drawing sinopia sketch sounding out standard study test test case touchstone tracing trial try verification vignette