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Black spots
I have some old varnished wood I want to strip down and reuse. This wood
has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon |
Black spots
Gordon inscribed in red ink for all to know:
I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon oxalic acid should take care of them... bob |
Black spots
Somewhere, someplace there must be someone that has had good luck getting
rid of dark areas in poorly maintained brightwork using oxalic acid. It has never worked for me.....sometimes the black is a little lighter but not much better. Dave "RW Salnick" wrote in message ... Gordon inscribed in red ink for all to know: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon oxalic acid should take care of them... bob |
Black spots
I tried it yesterday. Heavy on the oxalic in hot water. Used paper towels
wetted down and left on the spots for an hour. Yup, black is still there! Gordon "Dave W" wrote in message ... Somewhere, someplace there must be someone that has had good luck getting rid of dark areas in poorly maintained brightwork using oxalic acid. It has never worked for me.....sometimes the black is a little lighter but not much better. Dave "RW Salnick" wrote in message ... Gordon inscribed in red ink for all to know: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon oxalic acid should take care of them... bob |
Black spots
Is this wood oak, by any chance? If so, the discoloration may not be due
to fungus/mold/mildew, but rather due to a chemical reaction between the tannic acid in the wood and the metal in the screws. When done intentionally, it's a technique known as "ebonizing". Regardless of the cause, one solution would be to drill the holes oversize and glue in plugs to fill the holes. Done properly, it could create an interesting detail when the wood is reused. Gordon wrote: I tried it yesterday. Heavy on the oxalic in hot water. Used paper towels wetted down and left on the spots for an hour. Yup, black is still there! Gordon "Dave W" wrote in message ... Somewhere, someplace there must be someone that has had good luck getting rid of dark areas in poorly maintained brightwork using oxalic acid. It has never worked for me.....sometimes the black is a little lighter but not much better. Dave "RW Salnick" wrote in message ... Gordon inscribed in red ink for all to know: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon oxalic acid should take care of them... bob |
Black spots
Gordon inscribed in red ink for all to know:
I tried it yesterday. Heavy on the oxalic in hot water. Used paper towels wetted down and left on the spots for an hour. Yup, black is still there! Gordon "Dave W" wrote in message ... Somewhere, someplace there must be someone that has had good luck getting rid of dark areas in poorly maintained brightwork using oxalic acid. It has never worked for me.....sometimes the black is a little lighter but not much better. Dave "RW Salnick" wrote in message ... Gordon inscribed in red ink for all to know: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon oxalic acid should take care of them... bob Hi Gordon - I assumed that the black stain was iron - either leached from iron/steel fasteners, or from the action of iron-fixing bacteria. Oxalic acid is quite specific for iron stains. But black stains could come from other things too. Almost all metal powders look black. Metal powder could come from continued action of a fastener working in a hole, wearing away a fine dust of fastener and embedding it in the wood (eg. check your rag after using brasso...). I do not know how to remove this dust (and the method would depend on the particular metal involved) without damaging the wood. Also, the black could be due to bacteria colonizing the wood where it was unprotected by varnish, and had access to moisture. In this case, regular cholrine bleach will do a good job. bob |
Black spots
Brian Nystrom wrote: Is this wood oak, by any chance? If so, the discoloration may not be due to fungus/mold/mildew, but rather due to a chemical reaction between the tannic acid in the wood and the metal in the screws. When done intentionally, it's a technique known as "ebonizing". If that's the case, bleach will work. Sam |
Black spots
On Thu, 05 Oct 2006 18:16:41 GMT, Brian Nystrom briar.
Dave "RW Salnick" wrote in message ... Gordon inscribed in red ink for all to know: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon Sometimes hydrogen peroxide will lighten dark spots. A trick I learnes from an antique dealer. |
Black spots
On Fri, 06 Oct 2006 04:00:27 GMT, (Drew
Dalgleish) wrote: Sometimes hydrogen peroxide will lighten dark spots. A trick I learnes from an antique dealer. Does he deal in antique women? grin If he does, then he'd also but a splash of blue in it..... Younger ones use it neat.......bigger grin Regards, Bruce Nichol Talon Computer Services ALBURY NSW Australia http://www.taloncs.com.au If it ain't broke, fix it until it is.... |
Black spots
On Wed, 4 Oct 2006 09:17:09 -0700, "Gordon"
wrote: I have some old varnished wood I want to strip down and reuse. This wood has black areas around the old screw holes. How do I get rid of the black w/o sanding away all the wood? Thanks Gordon Life is often a matter of compromise. You have to sand quite a bit anyway if you are refinishing wood that's really on it's last legs. I strip with Citristrip, power sand with coarse grit down to the pink, then smooth and give two doses of Daly's AB, sometimes spot dosing the dark spots again. Then it's a light sand and start varnishing. I tried staining on a piece with embedded rust/rot/whatever from around bronze screws which had broken off but it didn't come out as well as I had hoped even though the holes were no longer noticeable. It all takes a long time and needs fairly high, consistent temperatures. The good news is it's worth it. |
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