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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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dpack
Joined: 02 Jul 2005 Posts: 46249 Location: yes
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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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cab
Joined: 01 Nov 2004 Posts: 32429
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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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cab
Joined: 01 Nov 2004 Posts: 32429
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Posted: Mon Jun 16, 08 8:09 pm Post subject: |
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Nanny wrote: |
even better then
so after i do this one with the salt and alum to keep the hair on one side, i could forget the salt, use perhaps 4 oz caustic to whatever the equivalent uk is to 10 american gallons and then go for it with another skin |
Okay... And the instructions are for potassium hydroxide?
Doing a little mental arithmetic... 1 mole of NaOH is 40g, and 1 mole of KOH is 56g. So Potassium hydroxide is near as dammit half as heavy again, and if memory serves its generaly wetter, so when converting from one to the other to keep the same 'strength' I'd use two thirds of the amount of sodium hydroxide as of potassium. So two thirds of 4oz would be two and two thirds ounces (just shy of 3oz).
(cut)
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rinsing is not problem as i have the river at the bottom of the garden, and i also have vinegar to counteract the caustic soda .... |
Vinegar should work... IF you want to be really clever, add juice from a red cabbage. It'll be blue until you've added enough acid to counter the lye, then it'll turn red. And as vinegar (or acetic acid) is a 'weak' acid (I wouldn't slosh neat acidic acid around, all the same, its 'weak' relative to 'strong' acids!) your mix should turn red when it is safe to pour away. |
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Tavascarow
Joined: 06 Aug 2006 Posts: 8407 Location: South Cornwall
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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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Posted: Mon Jun 16, 08 8:18 pm Post subject: |
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cab wrote: |
Nanny wrote: |
even better then
so after i do this one with the salt and alum to keep the hair on one side, i could forget the salt, use perhaps 4 oz caustic to whatever the equivalent uk is to 10 american gallons and then go for it with another skin |
Okay... And the instructions are for potassium hydroxide?
Doing a little mental arithmetic... 1 mole of NaOH is 40g, and 1 mole of KOH is 56g. So Potassium hydroxide is near as dammit half as heavy again, and if memory serves its generaly wetter, so when converting from one to the other to keep the same 'strength' I'd use two thirds of the amount of sodium hydroxide as of potassium. So two thirds of 4oz would be two and two thirds ounces (just shy of 3oz).
(cut)
Quote: |
rinsing is not problem as i have the river at the bottom of the garden, and i also have vinegar to counteract the caustic soda .... |
Vinegar should work... IF you want to be really clever, add juice from a red cabbage. It'll be blue until you've added enough acid to counter the lye, then it'll turn red. And as vinegar (or acetic acid) is a 'weak' acid (I wouldn't slosh neat acidic acid around, all the same, its 'weak' relative to 'strong' acids!) your mix should turn red when it is safe to pour away. |
ok
so for a max of 6 uk gallons you would use .....oh go on, you are a chemist, you will be able to tell me how much for 6 uk gallons and save my brain cells - how about an oz and a half?
i can use vinegar for rinsing, it says 1 pint (16oz) to 3 american gallons and leave it overnight so that is not a problem |
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cab
Joined: 01 Nov 2004 Posts: 32429
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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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vegplot
Joined: 19 Apr 2007 Posts: 21301 Location: Bethesda, Gwynedd
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Nanny
Joined: 17 Feb 2005 Posts: 4520 Location: carms in wales
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vegplot
Joined: 19 Apr 2007 Posts: 21301 Location: Bethesda, Gwynedd
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drunk_nik
Joined: 02 Jun 2008 Posts: 85
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cab
Joined: 01 Nov 2004 Posts: 32429
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