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Mushrooms, Mycology and Psychedelics > Mushroom Cultivation
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70% vs 91% alcohol?
    #2590789 -

While scouring my local walmart in the pharmacy department... all that I could find was the 70% isopropyl alcohol... I had two questions...

will the 70% work fine? or do I need the 91%?

if I need the 91% alcohol, where would this be found?

**edit... I saw that CVS sells the 91% isopropyl... but my cat already got 70%... since its so cheap, should my cat just toss the 70% or use it instead?

Edited by WSP1013 (04/22/04 11:30 AM)

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Re: 70% vs 91% alcohol? [Re: WSP1013]
    #2590802 -

i get 91% at walmart maybe they were just out.For the purposes you probably intend it for,70% is fine.But at my local walmart 91% is right on the shelf above the 70%,i use it for several other things where 70% contains too much water,so in that case 91% is better.


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Butternut squash are softer than acorn or other types of squash, which makes them easier to cut and prepare.

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Re: 70% vs 91% alcohol? [Re: ButterNut]
    #2590821 -

the plans are just to use it for a misting bottle and to sterilize certain surfaces (tables, jars, syringe, etc)

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Re: 70% vs 91% alcohol? [Re: WSP1013]
    #2590824 -

then yes 70% is fine,91% is better and Bleach will also work.


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Butternut squash are softer than acorn or other types of squash, which makes them easier to cut and prepare.

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Re: 70% vs 91% alcohol? [Re: ButterNut]
    #2590937 -

^^^^^


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Only for those who know what they are talking about

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Re: 70% vs 91% alcohol? [Re: DNICEONER]
    #2591313 -

the only difference is in the contact time, 70% has more water than 91% so it evaporates more slowly.


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"If I don't see ya before the end of this one, I'll meet ya in the next one and don't be late" - Jimi Hendrix

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Re: 70% vs 91% alcohol? [Re: forevrgrounded98]
    #2591503 -

forevrgrounded98 said:
the only difference is in the contact time, 70% has more water than 91% so it evaporates more slowly.


I never knew that, thats nice to know.

thanks

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Re: 70% vs 91% alcohol? [Re: chrisdab]
    #2602635 -

So does this mean 99% alcohol is better than 70% alcohol? Or does it only evaporate quicker? I read someone post that 70% has more antiseptic use than 99% but this doesn't sound right to me.


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Think for Yourself. Question Authority.

-Timothy Leary

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Re: 70% vs 91% alcohol? [Re: distortion]
    #2602654 -

the higher the percentage the less diluted it is.70% is 70 % alchahol 30% water by volume.
91% is 91% alchahol 9% water by volume
99% is 99% alchahol 1% water by volume.
therefor if there is less water it evaporates quicker.70% contains more than enough of a percentage to kill of bad guys for most purposes.just get the highest you can.91% or higher is used for hash oil making because it evaporates quicker,and ther is less water left over.


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Butternut squash are softer than acorn or other types of squash, which makes them easier to cut and prepare.

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Re: 70% vs 91% alcohol? [Re: distortion]
    #2602659 -

distortion said:
So does this mean 99% alcohol is better than 70% alcohol? Or does it only evaporate quicker? I read someone post that 70% has more antiseptic use than 99% but this doesn't sound right to me.


Alchohol kills micro-organisms by dissolving into their lipid membrane and then busting it apart as it evaporates. It's possible that 70% alcohol is better because it has more time to dissolve in the membranes of bacteria, whereas 99% evaporates so quickly that not enough gets into the membrane to lyse them. Who knows though...they both work fine.

--Aeolus

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Re: 70% vs 91% alcohol? [Re: WSP1013]
    #2602685 -

At work we make bacterial cultures on agar and we only use 70% ethanol. They tell us that it is the most effective concentration because the water content allows the cells to uptake the alcohol through the cell membrane. I would think 91% alcohol wouldnt be able to penetrate the cell membrane as the molecules are too big

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