Monday, January 21, 2008

Chemistry

Learning a new printmaking process: Lithography.
First you make a drawing with sticks of oil: lithography pencils, onto a block of special Bavarian stone.




Then you rub in a sprinkling of rosin powder, and after rub in a sprinkling of talc power.






When the oily drawing has absorbed the power, making the surface smooth, you mix a solution: a few drops of nitric acid with an ounce of gum arabic. You rub this in for a few minutes.





After that's rubbed in, you wipe off the excess with your hand, and buff the surface with a soft cheese cloth. That's your first "etch" in preparation to print.




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