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 Mushymush420
Traveler
Registered: 11/17/09
Posts: 194
Last seen: 11 months, 6 days
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 Can i re pressure cook agar? 
#13951550 - 02/12/11 01:17 PM (1 year, 3 months ago) |
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Hey, so i was pressure cooking agar in jelly jars and had to turn the stove off and leave when it was as 15psi for only 12 minutes.
Willi be able to re pressure cook the already hardened agar mix or should i empty them and start over?
Thanks guys
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pepper
SawDust Block Junkie
 
Registered: 10/31/10
Posts: 646
Loc: British Columbia 
Last seen: 8 months, 17 days
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I have bought agar prepared in a quart jar from a sponsor. So he PC it and than I reheated it to pour it. The answer is yes..
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falcon
In the green
Registered: 04/01/02
Posts: 5,149
Last seen: 10 hours, 45 minutes
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yeah, i usually do jars with agar for 20 minutes but on occasion have left it go for 45, with no problems.
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magnumzero
Soon-to-be Mycologist
Registered: 01/30/08
Posts: 513
Last seen: 6 months, 11 days
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Re: Can i re pressure cook agar? [Re: falcon]
#13955543 - 02/13/11 11:01 AM (1 year, 3 months ago) |
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Yep, I just did the same thing.
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BlueLightRain
WhoaUnbrokenChain
Registered: 01/14/11
Posts: 283
Last seen: 30 minutes, 40 seconds
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Re: Can i re pressure cook agar? [Re: magnumzero]
#13966666 - 02/15/11 09:11 AM (1 year, 3 months ago) |
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Yes. I sterilize my agar for 45 minutes after I initially brew it. I then allow my jars to cool (thus solidify) and leave them in a cabinet or refrigerator until I'm ready to use them. I then PC them for around 20 minutes to get them hot and liquid again.
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ArJunaSpore
Registered: 12/01/10
Posts: 74
Loc: Hydes Ferry, TN 
Last seen: 1 year, 26 days
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If the agar in the jar is still sterile you can just reheat it in a pot of boiling water. I have done this before when I was too tired to pour it after PC'ing and cooling. It worked out great.
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mycocozm
Registered: 05/13/10
Posts: 156
Last seen: 8 days, 22 hours
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Re: Can i re pressure cook agar? [Re: ArJunaSpore]
#14011200 - 02/22/11 11:26 PM (1 year, 3 months ago) |
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If the agar in the jar is still sterile, why bother reheating?
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 EvilMushroom666
Heretic
Registered: 11/18/09
Posts: 9,461
Loc: Canada
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Re: Can i re pressure cook agar? [Re: mycocozm]
#14011305 - 02/22/11 11:41 PM (1 year, 3 months ago) |
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To liquefy the hardened agar so you can pour your petri dish's.
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youngspacepod
PNW Greener
Registered: 05/29/11
Posts: 180
Loc: The South Sound
Last seen: 5 hours, 15 minutes
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iv had luck so far just taking the lid off my jar, (its metal) covering the opening with a paper towel leaving a small opening for heat to escape, and microwave my agar, watching it closely so i can turn it off before the bubbling reaches the paper towel.
depending on how much agar your trying to heat, you will have to repeat this a few times, giving the jar a little swirl or shake in between each heating. BE CAREFUL DURING THIS STEP if the paper towel is covering the entire opening hot steam WILL pour out of anywhere it can and burn your hand
if you do not heat it enough times you will end up with chunks of the agar that can really f**k up your pouring, tho myc will still grow on it.
i pressure cook my agar when i make it, i just us this process to reheat as it takes like 10 minutes then you just let it cool
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menelaus
Ghost
Registered: 07/24/11
Posts: 107
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God damn this makes my life easier. Thanks for asking the question and thanks for answering it everybody.
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