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Offlinecondonethis
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Gypsum Substitute?
    #4081377 - 04/21/05 03:30 PM (16 years, 29 days ago)

I was just wondering if anyone was aware of a substitute for gypsum, as it cannot be found locally, and I fear I will never pay the $9 to ship a $4 item? (good argument, ay?) My guess would be that since gypsum is a base that maybe a small amount of lime, but definitely not lye, would work.  Any response is greatly appreciated. I want to do this the right way the first time. Thanks.  :crazy:


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Invisibleshobimono
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Re: Gypsum Substitute? [Re: condonethis]
    #4081429 - 04/21/05 03:40 PM (16 years, 29 days ago)

Drywall is made of gypsum, so is blackboard chalk.


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InvisibleArp
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Re: Gypsum Substitute? [Re: condonethis]
    #4081441 - 04/21/05 03:41 PM (16 years, 29 days ago)

To keep the grains from sticking I reckon gypsum is what you should use as it doesnt dissolve with the water as lye but im only guessing, don't know realy :crazy:

I figure the gypsum works as a coating for the grains and that way prevents them from sticking.


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InvisiblePrisoner#1
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Re: Gypsum Substitute? [Re: shobimono]
    #4081527 - 04/21/05 04:07 PM (16 years, 29 days ago)

Quote:

shobimono said:
Drywall is made of gypsum, so is blackboard chalk.




drywall is made from gypsum but chalk is not.

as arp mentioned it works well to help prevent grains from sticking and also
works as a buffer to resist changes in PH, it also seems to help in the prevention
of many bacterial contams


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Offlinecondonethis
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4081543 - 04/21/05 04:16 PM (16 years, 29 days ago)

Quote:

Prisoner#1 said:
drywall is made from gypsum but chalk is not.




So I could buy commercial drywall and treat it as if it were in fact gypsum, introducing it directly to the substrate? Or is there a purification process it would have to undergo?


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InvisiblePrisoner#1
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Re: Gypsum Substitute? [Re: condonethis]
    #4081631 - 04/21/05 04:47 PM (16 years, 29 days ago)

Quote:

condonethis said:
Quote:

Prisoner#1 said:
drywall is made from gypsum but chalk is not.




So I could buy commercial drywall and treat it as if it were in fact gypsum, introducing it directly to the substrate? Or is there a purification process it would have to undergo?




commercial drywall is made from gypsum, if you hit a home improvement
store you can probably get a good size piece of scrap for free, buying a 4'x8'
sheet would run about $5 and that could last you a lifetime, just scrape it
along the edge with a piece of metal like the back of a knife, if you want it
finer then place that dust in a food processor, it will work as it is


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Offlinecondonethis
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4082668 - 04/21/05 09:13 PM (16 years, 29 days ago)

Thanks!


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Invisibleshobimono
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Re: Gypsum Substitute? [Re: Prisoner#1]
    #4083575 - 04/22/05 02:04 AM (16 years, 29 days ago)

Quote:

Prisoner#1 said:
Quote:

shobimono said:
Drywall is made of gypsum, so is blackboard chalk.




drywall is made from gypsum but chalk is not.





Do you have a source that says blackboard chalk is not gypsum? If you notice, I did say "blackboard chalk" and not "chalk", they are two different things.

These people sure think blackboard chalk is gypsum.

http://encyclopedia.laborlawtalk.com/Chalk

"Blackboard chalk is a substance used for drawing on rough surfaces, as it readily crumbles leaving particles that stick loosely to these surfaces. Blackboard chalk, often supplied in sticks about 5 cm long, is not actually made from the mineral chalk but from gypsum (calcium sulfate)."

Here people down in Zambia mine it and they say blackboard chalk is gypsum.

http://66.102.7.104/search?q=cache:zWjwv...chalk&hl=en


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Offlinejung_gun
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Re: Gypsum Substitute? [Re: shobimono]
    #26193566 - 09/17/19 12:23 PM (1 year, 7 months ago)

Hello shobimono,

Most of the time chalk is made from Calcium Carbonate. Calcium Carbonate is actually Lime or Limestone, while Gypsum is Calcium Sulfide. While both will provide much needed calcium to the mushrooms... chalk, limestone, lime, or calcium carbonate in any form is a bad thing because it will raise the pH level of the soil. The mycelium creates its own acid and this can negatively impact its growth or stop it completely.

Calcium Sulfide or gypsum or dry wall on the other hand, will raise not only calcium (good for mushrooms), and sulfides (bad for bacteria), while also not impacting the pH levels (a good thing).

TLDR; Both lime(limestone/chalk/calcium carbonate) and gypsum(drywall/calcium sulfide) will provide calcium, but only lime will raise the pH (which is bad).

lol... whoops, just realized this post is 14 years old!


Edited by jung_gun (09/17/19 12:24 PM)


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OfflinecronicrM
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Re: Gypsum Substitute? [Re: jung_gun]
    #26193678 - 09/17/19 01:15 PM (1 year, 7 months ago)

Sober up


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Offlinebrownstone420
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Registered: 10/01/20
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Re: Gypsum Substitute? [Re: jung_gun]
    #26963096 - 10/01/20 01:26 AM (7 months, 11 days ago)

Thanks alot your comment really helped me however.  I was wondering for a long time of the info you provided.. on diff between gypsum and limestone - and now I know.  Thanks!


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