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A very fine asphaltum powder fused to a copperplate, or rosin fused
to gelatin, or a photo image of the powder exposed to the gelatin,
create minute "lands" which will remain unetched. Between
these "lands", crevices are etched so that they will hold
ink.

Known as aquatint for its resemblance to the wash effects of watercolor,
this technique greatly expanded the tonal range of etching when
invented in the 18th century.

Very fine asphaltum or rosin particles suspended in a box are allowed
to rain down on the copper or gelatin in a random pattern. These
particles are then fused to the plate or the gelatin over high heat
until they melt lightly.

The photographic acquatint, or photographic screen, is simply a
positive photo of the powder exposed into the gelatin, after exposure
of the image.
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