Crossfade by Esak /code/effects/pallette/crosfade.zip	21 Sep 1997 (catalog date) 55,071 bytes
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Includes a good explanation of how it works.

Palette Routines by Esak /code/effects/pallette/fadecode.zip	29 May 1997 (catalog date) 31,921 bytes
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Smooth palette fading routines, palette rotation, etc.