On Mon, 06 Jul 2015 12:15:05 +0100, Chris Hogg wrote:

On 5 Jul 2015 14:26:10 GMT, Emery Davis wrote:

On Sun, 05 Jul 2015 13:37:24 +0100, Chris Hogg wrote:

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As for strength, lets see if I've got the arithmetic right. The
recommended dosage is 2.5/10000, at 35%. I have that as ~ 0.009%.

That's 2.5 ml of 35% peroxide in 10 litres?


Yup.

I note that 35% H2O2 isn't available in the UK and more. Apparently it's
illegal to sell it. Maximum strength allowed these days is 12%. So that
would be 7.5ml of 12% in 10 litres.

That's curious, I wonder why it's been controlled. Can't blame this one
on the EU apparently! The stuff I get is called something like
'oxypower' and is labeled for hydroponic use.


I got some 35% on a finger once, the skin turned bleach white.

Doesn't it just!

Still not sure how it happened as I do where gloves when measuring the
stuff!

-E




--
Gardening in Lower Normandy