Bleaching wood
whisky-dave
I've taken most of the varnish off of some stair banisters and two
hand rails that had a dark varnish on them, most of the remaining wood
still isn't as light in colour as I'd like it. I was hoping to find
something in a
high street B&Q or somewhere. I've found a few suppliers of chemicals
like oxalic acid and hydrogen peroxide and sodium hydroxide, but I'd
like something a bit easier and perhaps safer, some can of something
that says "I lighten and bleach wood" on it.
I'm not sure what wood it is, but assuming it;'s not expensive wood.
Any suggestions......
The Natural Philosopher
Oxalic acid=Rhubarb (leaves?)
Hydrogen peroxide= hair bleach
Sodium hydroxide..well that is a tad excessive: it's caustic soda but
isn't a huge issue though it will belach (and rot) fabrics.
I think you left one out - sodium hypchorite IIRC is standard houshold
bleach.
However, really all this farting about with cheap wood seems pointless.
Paint them or get hardwood ones made or something. Life's too short.
Andy Wade
> Any suggestions......
Rustin's Wood Bleach kit worked for me:
http://www.rustins.co.uk/wbleach.htm
--
Andy
stuart noble
The only bleach that might work is the 2 part caustic/peroxide type, and
that will lighten the wood itself but not any stains or varnish that may
be left from the stripping.
The peroxide in woodworking bleach is about 30 times stronger than hair
products and stings like crazy. Not something I'd recommend unless
you're going to take precautions
ma...@atics.co.uk
>
> - Show quoted text -
Dear All
Caustic products (ie sodium or potassium hydroxide) are used to
extract hemicelluloses from the surface of the wood and thus change
the structure of the outer parts. For that reason I do not use them
(execept in the lab to extract the hemicelluloses!).
If I were to lighten the wood I would consider the chlorine based ones
but agree with the post that lightening wood like this is a
questionable objective. If you want them light - paint them. They were
never designed to be seen as wood in the first place so to so so now x
years later is not really in keeping with the original building. Who
knows in 50 years time someone may say liken the action to the way in
which in the 1950s all the Victorian panelled doors were covered up
with hardboard!
Rant over..
BTW oxalic acid is pretty nasty stuff and if there are any children
around --- care
Chris
m1ss_...@yahoo.co.uk
>
> None of the aboce are especially dangerous
>
Ask the Bradford 4 about H2O2?
stuart noble
Yeah, well they bought masses of hairdressing strength, which says it
all really.
stuart noble
> Dear All
> Caustic products (ie sodium or potassium hydroxide) are used to
> extract hemicelluloses from the surface of the wood and thus change
> the structure of the outer parts. For that reason I do not use them
> (execept in the lab to extract the hemicelluloses!).
> If I were to lighten the wood I would consider the chlorine based ones
IME ordinary household bleach has no effect on wood, other than to
darken it slightly if you use the "thick" versions which contain caustic
soda. Milton sterilising fluid is pure hypochlorite I think but, as I
say, does nothing IME.
> but agree with the post that lightening wood like this is a
> questionable objective. If you want them light - paint them. They were
> never designed to be seen as wood in the first place so to so so now x
> years later is not really in keeping with the original building. Who
> knows in 50 years time someone may say liken the action to the way in
> which in the 1950s all the Victorian panelled doors were covered up
> with hardboard!
> Rant over..
Rant away! I stripped and bleached mine. Douglas fir spindles and a
mahogany handrail. The Victorians painted them because the wood was
cheap. Now it isn't, so I can impress my friends and have cheese and
wine parties on the stairs :-)
> BTW oxalic acid is pretty nasty stuff and if there are any children
> around --- care
Can be fatal by ingestion IIRC. IME children are so conservative and
cautious about food and drink that it's difficult to believe they would
just pick up something unfamiliar and eat it.
The Natural Philosopher
Try buying it in sufficient concentration..
Heck you can make gunpowder out of bird shit.
That doesn't make it unsafe to spread on the roses.
The Natural Philosopher
>
>> Dear All
>> Caustic products (ie sodium or potassium hydroxide) are used to
>> extract hemicelluloses from the surface of the wood and thus change
>> the structure of the outer parts. For that reason I do not use them
>> (execept in the lab to extract the hemicelluloses!).
>> If I were to lighten the wood I would consider the chlorine based ones
>
> IME ordinary household bleach has no effect on wood, other than to
> darken it slightly if you use the "thick" versions which contain caustic
> soda. Milton sterilising fluid is pure hypochlorite I think but, as I
> say, does nothing IME.
>
>> but agree with the post that lightening wood like this is a
>> questionable objective. If you want them light - paint them. They were
>> never designed to be seen as wood in the first place so to so so now x
>> years later is not really in keeping with the original building. Who
>> knows in 50 years time someone may say liken the action to the way in
>> which in the 1950s all the Victorian panelled doors were covered up
>> with hardboard!
>> Rant over..
>
> Rant away! I stripped and bleached mine. Douglas fir spindles and a
> mahogany handrail. The Victorians painted them because the wood was
> cheap. Now it isn't, so I can impress my friends and have cheese and
> wine parties on the stairs :-)
>
It is still compared with the time to do all that..
>> BTW oxalic acid is pretty nasty stuff and if there are any children
>> around --- care
>
> Can be fatal by ingestion IIRC. IME children are so conservative and
> cautious about food and drink that it's difficult to believe they would
> just pick up something unfamiliar and eat it.
huh?
Mark
Yes, they wanted to bleach their long hair?
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Rod
I thought at least some of the H2O2 had been bought in High Wycombe (and
nearby). Don't want to be left out... :-)
--
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whisky-dave
"stuart noble" <stuart...@ntlworld.com> wrote in message
news:qbcXj.12786$q96...@newsfe18.ams2...
>
>
>> BTW oxalic acid is pretty nasty stuff and if there are any children
>> around --- care
>
> Can be fatal by ingestion IIRC. IME children are so conservative and
> cautious about food and drink that it's difficult to believe they would
> just pick up something unfamiliar and eat it.
Only if you tell them not to eat it.
I bet of I did tell any kids to eat it because it's good for them they'd
never touch the stuff again. ;-)
(anyone see that program on negistive suggestion last night ?)
whisky-dave
"Andy Wade" <spamb...@maxwell.myzen.co.uk> wrote in message
news:693t2iF...@mid.individual.net...
Chees that looks worht a try.
whisky-dave
> The peroxide in woodworking bleach is about 30 times stronger than hair
> products and stings like crazy. Not something I'd recommend unless you're
> going to take precautions
I'd take precautions, gloves, goggles, white coat, steel toe capped boots
and the all important comdon ;-)
stuart noble
One problem with brushing spindles crossways is that the peroxide can
flick off the bristles and end up further away than you might think. You
won't see where exactly until it dries. Spotted carpets etc.
The other thing to remember is that you really need 2 synthetic brushes
(Pound Shop type) and 2 plastic containers to decant into. Keep part a
and b separate because the peroxide bottle will swell if there's any
hint of cross contamination.
The white coat would be a good idea :-)
Owain
> I'd take precautions, gloves, goggles, white coat, steel toe capped boots
> and the all important comdon ;-)
Would it be better to apply it using a pressure washer from a safe distance?
Owain
stuart noble
The mind boggles. Perhaps you should have included a smiley, just in case