| 21. | He worked in etching, line and stipple engraving, as well as aquatint.
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| 22. | The first 14, in etching and aquatint, are dated 8 January 1937.
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| 23. | Till 1948 ninety of these aquatints were exhibited in Keukenhof Castle, but sold.
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| 24. | Some of his drawings were published in aquatint.
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| 25. | In 1988 Matt started his own publishing company Spilled Inc . producing aquatint lithographs.
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| 26. | During this time, Bishop began working in various printing techniques, most notably aquatint.
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| 27. | Each plate was accompanied by descriptive text with a dedication and a vignette in aquatint.
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| 28. | In the mid-1950s he experimented with lithographic techniques such as woodcut and aquatint.
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| 29. | He worked in a variety of media, especially stipple, contour etching and aquatint.
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| 30. | Like etching, aquatint uses the application of a mordant to etch into the metal plate.
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