Artist Carne Griffiths uses calligraphy ink and various types of tea (think chamomile, early grey, chai, etc) to blend the lines on his drawings. Then, he repeats the process, layering the work. For his homemade lightboxes, he makes double sided drawings then adds in a light behind it so that the hidden image only comes through when the cord is pulled and the light switches on.
See more at My Modern Met.
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