That's why people who do embossing on vellum normally draw the design with white ink, then flip it over and dry-emboss the white lines using a stylus. Google parchment craft or pergamano.
You could use a white gel pen, or staz-on in cotton white, then trace the lines on the back using a ball-tip stylus. Make sure you have a mousepad or a piece of fun foam under the piece when you do this.
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