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>large format color geologic maps in. ...more stable technology.
 
What about electrostatic color plotting?  That should have a color
stability of several decades, particularly if not exposed to UV light, I
would think.
 
Inquire of Jeff Rank at Color XL in Middleton (suburban Madison),
Wisconsin.  1-888-COLORXL.
 
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Dennis McClendon, Chicago CartoGraphics      [log in to unmask]