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Mushrooms, Mycology and Psychedelics > Mushroom Cultivation
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H2O2 concentration?
    #3406519 -

I've read a lot about peroxide/water mixes here. Some examples;

10 parts water, one peroxide.
3 parts water, one peroxide.
A cap full.
A few glugs.

I've learned that the stuff is good for mycelium, and bad for spores. I've read that it's too strong when straight from the 3% bottle.

Does anyone here have the bottom line on this? At what point does peroxide stop helping and start hurting?

Thanks.


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Don't panic!

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Re: H2O2 concentration? [Re: ticktock]
    #3406542 -

peroxide always harms mycelium. its just at the diluted rate of 10% it's not too harmful that it destroys mycelium. I believe 10% is the crossover rate.


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better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.

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Re: H2O2 concentration? [Re: derx]
    #3406614 -

derx said:
peroxide always harms mycelium. its just at the diluted rate of 10% it's not too harmful that it destroys mycelium...(snip)


That could be right, but it's not what I've read. When mycelium meets a low level of H2O2, it converts it to O2. Have a look at this. I've also read the mycelium make their own H2O2 when possible. It gives the fungus an advantage.

So, again; At what point does a good thing turn bad?

Thanks.


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Don't panic!

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Re: H2O2 concentration? [Re: derx]
    #3406618 -

right, but we don't usually mix 10%. 10 parts water and 1 part h2o2 would be 11 parts, so 1/11 is approximately... 9.1%... times 3% h2o2... 0.27% actual peroxide in the mixture. enough to be helpful, but not enough to really damage the mycelium.


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"a monkey would fuck you up if you tried to put it in a autoclave" - Psychoslut

"it's not like the admins and mods are a tight-knit group of hippies that spend their life together in a log cabin tie-dying shirts and stringing beads inbetween bonghits." - Wiccan_Seeker

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Re: H2O2 concentration? [Re: ZeroArmy27]
    #3406628 -

ZeroArmy27 said:
right, but we don't usually mix 10%. 10 parts water and 1 part h2o2 would be 11 parts, so 1/11 is approximately... 9.1%... times 3% h2o2... 0.27% actual peroxide in the mixture. enough to be helpful, but not enough to really damage the mycelium.


Right. I've noticed a lot of bad math about this. A lot of people are shooting for 10%, but some are using 9 to 1, and some 10 to 1. Some seem to be using 3 or 4 to 1.

Perhaps 50/50 would be a killer. 60/40 ? Where is the line?


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Don't panic!

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Re: H2O2 concentration? [Re: ZeroArmy27]
    #3406633 -

of course i didnt mean 10% of straight h202, i meant 10% of 3% H2O2, which is what you said with the .27%. I wouldn't go past this mark. Sorry about the confusion.


--------------------
better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.

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Re: H2O2 concentration? [Re: derx]
    #3407074 -

oh, it's not just you that's confused, it's most of the board. they just spit out the 10% rhetoric because it's passed around here so much.

10 parts + 1 part = 11 parts. how do you get 10% out of 1/11th of the mix?


--------------------
"a monkey would fuck you up if you tried to put it in a autoclave" - Psychoslut

"it's not like the admins and mods are a tight-knit group of hippies that spend their life together in a log cabin tie-dying shirts and stringing beads inbetween bonghits." - Wiccan_Seeker

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Re: H2O2 concentration? [Re: ZeroArmy27]
    #3407080 -

I never measure, I just try adding what i think is 10% of my 3% H2O2 solution to my water bottle. My water bottle is 16 oz, i try to add around 2 ounces by eye. The first measuring level is 4oz.


--------------------
better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.

Extras: Filter Print Post Top
Re: H2O2 concentration? [Re: derx]
    #3407089 -

so 2 of 16 is 10%? 1/8 is not 1/10th. oh god, i'm the math police now.

as long as it's pretty diluted, i don't see a big difference.


--------------------
"a monkey would fuck you up if you tried to put it in a autoclave" - Psychoslut

"it's not like the admins and mods are a tight-knit group of hippies that spend their life together in a log cabin tie-dying shirts and stringing beads inbetween bonghits." - Wiccan_Seeker

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Re: H2O2 concentration? [Re: ZeroArmy27]
    #3407091 -

NAZI!


--------------------
better living through chemistry

OVERGROW the government!!

it's not a war on drugs, it's a war on personal freedom, ok, thats what it is.

Extras: Filter Print Post Top
Re: H2O2 concentration? [Re: derx]
    #3407277 -

I agree all this 1:10 ratio of 3% and calling it 10% blah blah is all very sloppy. Especially for a learning chemist DERX! 10% of 3% is 0.3% .. tut tut. :smile:

From my rudimentary BSC chemistry studies I know that.. I get 9% peroxide, when I dilute it 1cc in 2cc of water I have 3cc of 3%. If I then add another 3cc of water I have 6cc of 1.5%. another 12cc H20 gives .5%, Its really quite simple. For quick, simple measurements -Double the volume= half conc. Triple the vol= 1/3 conc.

I've used 1.5% (ACTUAL!) concentration in anything pre-fruiting stage with no noticable retardation of the growing process, dunking etc. For misting I dilute to about 0.5%, again, no noticable side effects, aborts or anything... yet.. unfortunately I am very limited to my experiments with a single strain.

ein volk,
ein reich,
ein concentration of H202 dammit!


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