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Oak filler

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willstewart:
I have often on various woods used sawdust made into a paste with wood glue (eg Titebond) as a filler for cracks etc.  This seemed fine until I just tried it with oak.  The paste looked fine and a good match but it went black on drying.  The colour seems all through and does not disappear on sanding the surface. Has anyone else seen this? Does all PVA do it?  I seem to recall that oak is the traditional base for some inks.

Lazurus:
You may find it is the tannin leaching out of the oak fibres?

willstewart:
It could well be.  The glue directly on the wood has no effect so it must be something to do with the powdering. 

Derek:
Where did you pick the saw dust up from. Was it from a bench near a grinder which had filings on it? I have used oak sawdust mixed with PVA and did not have the reaction that you got.

willstewart:
Made specially from an offcut of the same wood.  Hard to see why there should be metal in it - though I did use a stainless steel knife to spread it.

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