If the purple color develops as the result of exposure to sunlight, you don't
have to do anything: it'll stay purple forever.
Doug Miller (alphageek-at-milmac-dot-com)
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From one of the many websites out there:
Color Change: Purpleheart undergoes an extreme degree of color change over
time. When freshly milled or sanded, Purpleheart will be a brown color,
which will change within a few days to a vivid purple color. Then over time
( 6 months+ ) the vivid purple will oxidize back to a brownish color with
purplish highlights. Water based finishes tend to inhibit the full color
change and hold more of the purple color.
You could apply a finish that have uv blockers in it.That will delay the
darkening of the wood if it is in a sunny area.
All wood will darken in time but leaving it in the sun will speed the
process up dramaticly.
The fancy highend items I've made with purpleheart as a highlight wood
combined with oak,maple etc still look outstanding even though the
purpleheart has darkened.As of today no customer has complained about the
change of color affecting the quality of the piece
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