Kinshi bottle sourcing

I know how to make kinshi and also have grown edible mushrooms for years. There is absolutely no need for special bottles for the mycelium to proliferate. You can row the mushroom in a bag then transfer the mycelium or you can just do what I do and grow them in tight deli cups with processes for sterlization and handmade filters. 

 
You can row the mushroom in a bag then transfer the mycelium or you can just do what I do and grow them in tight deli cups with processes for sterlization and handmade filters. 
Were there any issues with pressure cooking the deli cups? Also were you able to get decent yields or do you think I should just get bags?

 
You can blow your house if you pressure can a mason jar. 
Wouldn't the mason jar just implode in the pressure cooker?

And yeah I wouldn't pressure cook anything that wasn't vented-- Not to mention I'm using an instant pot for sterilization (I bet a lot of people would hate that but 2 weeks in no contams in 12 jars of spawn! mix of oyster and lions mane on millet)

I'm also going to see if the compost is at all comparable to the flake soil I made last summer, I bet it would be pretty broken down

 
No, the pressure canner can't hold that much pressure when there is something in the mason jar. The lid will explode and everything within 15 feet will get crushed. Your roof will burst btw pressure canners are not meant to put mason jars into. If you get lucky it won't burst, but it will damage the pressure canner. 

 
No, the pressure canner can't hold that much pressure when there is something in the mason jar. The lid will explode and everything within 15 feet will get crushed. Your roof will burst btw pressure canners are not meant to put mason jars into. If you get lucky it won't burst, but it will damage the pressure canner. 
I might just be misunderstanding-- Aren't mason jars filled with fruits and vegetables explicitly the main thing that should be put in a pressure cooker?  Also, since all my mason jars have holes in the lids, wouldn't it be the same as if I had a pressure cooker full of beans? 

I am a VERY risk adverse person and when the instant pot is on I stay well away from it, but that being said, I feel a little foolish doing so since that seems to be the way 99.99% of mushroom people sterilize their grain spawn.  That being said I am concerned if I'm doing something very unsafe. @Devastryk can you confirm or deny being a mushroom person, or help explain if I'm missing something?

 
I've seen multiple people using mason jars for their pressure cookers with no problems...

 
If you use the syringe on a water added treager pellet, do you get kinshi?
Yes but the chance of contamination will be too high. For best results, pressure cooking the substrate at 15PSI for 90 minutes before inoculation is recommended.

 
Were there any issues with pressure cooking the deli cups? Also were you able to get decent yields or do you think I should just get bags?
Yes decent yields, but because you get better flushes with greater surface area, bags give a lot of flexibility in this aspect. I am saying that growing mushrooms and fearing contamination is a bit exaggerated. In essence if you know how to properly manage using enough spawn and amount of additive you can figure out a medium where pressure cooking isnt necessary at all. There are many people that grow some of the faster growing mushrooms on wood chips that are not even pasteruized. The more processed and wet the medium is, the more sterilization becomes important. The more spawn you add in the beginning, the less sterilization required as contamination is a bigger issue when starting cultures. Look at youtube. For people that use lots of initial spawn and have small amounts of medium leading to very quick colonization, they have no filters and just grow mushrooms in totes.

 
I might just be misunderstanding-- Aren't mason jars filled with fruits and vegetables explicitly the main thing that should be put in a pressure cooker?  Also, since all my mason jars have holes in the lids, wouldn't it be the same as if I had a pressure cooker full of beans? 

I am a VERY risk adverse person and when the instant pot is on I stay well away from it, but that being said, I feel a little foolish doing so since that seems to be the way 99.99% of mushroom people sterilize their grain spawn.  That being said I am concerned if I'm doing something very unsafe. @Devastryk can you confirm or deny being a mushroom person, or help explain if I'm missing something?
I put mason jars in an insta-pot for 90 minutes just a few weeks ago. It has been fine for me, and it seems others have success with this very method. The only issue I am aware of is that, apparently, insta-pots do not reach the same temperatures or pressures as the stove-top ones. You will have to increase sterilization time if using one. 

 
I put mason jars in an insta-pot for 90 minutes just a few weeks ago. It has been fine for me, and it seems others have success with this very method. The only issue I am aware of is that, apparently, insta-pots do not reach the same temperatures or pressures as the stove-top ones. You will have to increase sterilization time if using one. 
I put mine in for 3 hours- do you think 90 minutes is fine?

 
How did it go? 
Everything has gone well for the most part-- my lion's mane have a little blue mold in the oak flake soil but I'm waiting to see if the mycelium out-competes it, which is a bummer cause that's what I wanted to use as beetle substrate after.

The pink oysters have started fruiting (I used plastic totes instead of jars/kinshi bottles):
https://photos.app.goo.gl/wH9k7Zeo3uHnzhsT8

I'm having some issues with keeping the fruit humid enough since I live in Maine and the air is super dry in winter.  The king oyster and blue oyster are pretty heavily colonized and should start fruiting soon too- so I might make some sort of humidity tent for them.

 
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