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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      <a href="/scripts/wa-UGA.exe?LOGON=A3%3D9803%26L%3DMAPS-L%26E%3D7BIT%26P%3D83331%26B%3D--%26T%3Dtext%252FplainTEXT%252FPLAIN%3B%2520charset%3DUS-ASCII%26pending%3D" target="_parent" >[log in to unmask]</a>