6Oct/09Off
Offset Black
Offset lithorgraphy help?
Hi I'm revising offset lithography for my GCSE graphics exam in a few weeks and wanted to know some more about offset lithography..
First of all machines that print in full colour use the colour process CMYK. Why does K stand for black?
How is ink attracted to the image? Are the plates charged?
Anything that can help me understand the process better would be helpful.
Many thanks.
K stands for black because this CMYK does use the same sorts of abbreviations as RGB and B stands for blue. Since B is taken what letter can best represent black? K isn't used by any other color.
I'm more familiar with traditional lithography than with offset lithography. In traditional lithography the plates are stones you draw on with a wax stick then etch the surface off with a mild acid. The ink stays in the grooves until it's time to press the paper into them.
How Stuff Works has an article on offset printing here:
http://www.howstuffworks.com/offset-printing.htm
According to it, photosensitive chemicals harden the plate on offset printing, and make them water resistant. Then the plate is wet before ink is applied, and the ink is water repellant so falls off the wet spots while sticking to tehe water resistant parts.
No the plates aren't charged.
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