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Thread: Timber turns purple!
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23rd July 2018, 09:54 PM #1Senior Member
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Timber turns purple!
I got roped into clearing out a hoarders house a few years ago, and one of the things he liked collecting was rare and exotic hardwoods. I ended up coming home with a car and boot full of short lengths of light and dark through to black timber. One of these pieces I've machined up for a project, and it is weird.
Leave it for a day or even shorter, and it turns purple! Some air reaction is going on, and light sanding doesn't remove it. Haven't tried washing it out yet. Not that I dislike it, its just peculiar.'
So two questions arise - what is it? And I wonder how it will affect a clear finish?
Any clues?
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23rd July 2018, 10:11 PM #2
I’d reckon you have some Purpleheart there. Google it, or search within this forum.
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23rd July 2018, 11:14 PM #3GOLD MEMBER
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PurpleHeart.
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23rd July 2018, 11:24 PM #4Senior Member
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23rd July 2018, 11:38 PM #5
Use a UV paint like car top coat clear, otherwise it will turn brown again pretty quickly
Neil____________________________________________Every day presents an opportunity to learn something new
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24th July 2018, 12:07 AM #6Senior Member
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24th July 2018, 09:12 AM #7
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24th July 2018, 09:41 AM #8
Similarly, I have spin tops and pens with Purple Heart segments in them that have retained their colour well. They have been finished with Minwax WOP, Wattyl Stylwood, Dulux spray can Estapol (early attempts) and a couple of other finishes including oils.
Not sure on the mechanism / chemistry of the colour change but it does appear to be an "oxidation" process to create the initial change to purple then colour degrades as with most timbers to UV exposure. I think there are a couple of species marketed as "purple heart" as I have found some to be quite brittle and difficult to work and others much more user friendly, could be just the kiln drying process. It was sold in FNQ as decking bearers and joists for a while in the 1990's.Mobyturns
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24th July 2018, 10:07 AM #9Neil____________________________________________Every day presents an opportunity to learn something new
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