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| Removing water stains from bending... http://luthiersforum.com/forum/viewtopic.php?f=10101&t=50586 |
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| Author: | meddlingfool [ Tue May 01, 2018 7:45 pm ] |
| Post subject: | Removing water stains from bending... |
Been a long time since I've had a problem, but today I bent up some Aussie Blackwood and it turned a lovely shade of green. I know it will sand out eventually, but I recall there may be a solution that removes the stain. Oaxic acid or something maybe? |
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| Author: | Trevor Gore [ Tue May 01, 2018 9:31 pm ] |
| Post subject: | Re: Removing water stains from bending... |
Oxalic acid will do the job. Over do it, blackwood will go a bronzey colour. Not unattractive, but maybe not what you want. Wash the oxalic off with dilute white vinegar, then water. Anything with a basic pH (i.e. alkaline) will turn it green or black again. |
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| Author: | meddlingfool [ Wed May 02, 2018 12:05 am ] |
| Post subject: | Re: Removing water stains from bending... |
Are you saying it will go a bronze color if I overdo the acid? |
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| Author: | Trevor Gore [ Wed May 02, 2018 3:38 am ] |
| Post subject: | Re: Removing water stains from bending... |
Yes. There is more red to the colour, heading in a mahogany direction. It's not unattractive, but may not be what you had in mind. Check it out on an off-cut. Some blackwood starts out that colour anyway, but if it went green on you it probably started out more on the brown side. |
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| Author: | ernie [ Wed May 02, 2018 7:14 am ] |
| Post subject: | Re: Removing water stains from bending... |
I oversize my sides to possibly remove stains , anomalie,s etc with a very small sharp scraper blade as found in a stanley number 80 scraper |
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| Author: | meddlingfool [ Wed May 02, 2018 9:37 am ] |
| Post subject: | Re: Removing water stains from bending... |
Thanks folks! Fortunately most of it is on the inside. I reflect on the irony of how I can go dozens and dozens of guitars problem free on the budget line, but as soon as it's a show glossy with a deadline, things go squirrelly...  This is its color, and the color I'd like for it to stay. |
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| Author: | meddlingfool [ Wed May 02, 2018 11:33 am ] |
| Post subject: | Re: Removing water stains from bending... |
I think this is the stuff I'm after? https://www.homedepot.ca/en/home/p.all- ... 39775.html |
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| Author: | meddlingfool [ Wed May 02, 2018 11:51 am ] |
| Post subject: | Re: Removing water stains from bending... |
Turns out you can get it in crystal form at Shoppers Drug Mart! That store gets better and better:) |
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| Author: | Clay S. [ Wed May 02, 2018 12:18 pm ] |
| Post subject: | Re: Removing water stains from bending... |
Many paint stores carry oxalic acid. It is poisonous so use a little bit of care ( don't put it near your coffee mug). |
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| Author: | Trevor Gore [ Wed May 02, 2018 5:09 pm ] |
| Post subject: | Re: Removing water stains from bending... |
I get it in crystal form from the hardware store, just labeled Oxalic Acid. Use "rubber" gloves. |
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| Author: | meddlingfool [ Wed May 02, 2018 5:19 pm ] |
| Post subject: | Re: Removing water stains from bending... |
Thanks Trevor! What is the mix ratio, and are nitrile gloves "rubber" enough? |
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| Author: | Trevor Gore [ Wed May 02, 2018 10:22 pm ] |
| Post subject: | Re: Removing water stains from bending... |
meddlingfool wrote: ...are nitrile gloves "rubber" enough? Anything that will keep it off your hands. Nitrile should be fine. meddlingfool wrote: What is the mix ratio... The directions on my stuff say 250gm per litre. However, I use it at much lower dilutions, probably more like a tablespoon per pint, or a teaspoon per jam jar. Test, test, test. You may have to treat the back too, to get a good colour match. |
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| Author: | meddlingfool [ Wed May 02, 2018 11:44 pm ] |
| Post subject: | Re: Removing water stains from bending... |
Thanks very much! |
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