Depending on the medium used, underdrawing in embroidery and other decorative techniques may be revealed by radiography where it is relatively radio-absorbent in comparison to other materials used either in the original artefact or in later mounting and conservation methods.
Source: wiktionary
When subjected to printing or photocopying, the blue underdrawing will disappear, leaving only the ink lines.
Source: wiktionary
The 'Aegyptiaca' would thus have removed herself from the embrace in the underdrawing and have turned towards the woman who is just awakening from her dream.
Source: wiktionary
You can use a croquis as an underdrawing for fashion drawing
Source: wiktionary
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