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Shop: North Spore Bulk Substrate   Mushroom-Hut Substrate Mix

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Invisiblejmg5
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rust?
    #5353697 - 03/01/06 02:06 PM (17 years, 10 months ago)

I was harvesting some mushies off of a casing, (this casing has been shrinking, and as it was I would just add more casing layer to the edges) when I noticed that it had shrunken significantly, and all along the sides of the aluminum tray there was rust.  Wherever there was rust on the side of the tray, it was also on the side of the casing!  So on all of the edges of the casing (now a block that you can pick up, it's solid) there's rust,  I won't be trying for a second flush, but do you think these shrooms are unfit for consumption?  I'm pretty sure it's just rust and not an orange/red contam, as it lines both the casing and the tray.

Any help is appreciated :frown:


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OfflineDelinquentes
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Re: rust? [Re: jmg5]
    #5353700 - 03/01/06 02:07 PM (17 years, 10 months ago)

Rust? Aluminum? This is interesting.

I' make darn sure it's not a contaminant.



--------------------
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and your old lady has just gone down!" ~~ Zappa



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Edited by Delinquentes (03/01/06 02:08 PM)


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OfflineFraggin
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Re: rust? [Re: Delinquentes]
    #5353706 - 03/01/06 02:08 PM (17 years, 10 months ago)

Doubtfully rust. Aluminum corrodes.. not rusts.


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Invisiblejmg5
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Re: rust? [Re: Fraggin]
    #5353713 - 03/01/06 02:12 PM (17 years, 10 months ago)

Ok, sorry, it definitely is not aluminum because these trays do rust! The bottom of the trays have rust, too, from excess water on the bottom of the fc, it's just a sterilite tub with a reptile heat pad underneath it, keeps the humidity well but water does pool at the bottom every once in a while.


Edited by jmg5 (03/01/06 02:12 PM)


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OfflineFraggin
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Re: rust? [Re: jmg5]
    #5353714 - 03/01/06 02:13 PM (17 years, 10 months ago)

Rust is only iron oxide. If anything, I presume it would aid as nutrition for the substrate. They are safe to eat if it is indeed rust.


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OfflineDelinquentes
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Re: rust? [Re: Fraggin]
    #5353716 - 03/01/06 02:13 PM (17 years, 10 months ago)

Quote:

Fraddin wrote "Doubtfully rust. Aluminum corrodes.. not rusts."





Aluminum oxidizes....That oxidation subsequently prevents corrosion. :laugh:


--------------------
"The price of meat has just gone up,
and your old lady has just gone down!" ~~ Zappa



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OfflineDelinquentes
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Re: rust? [Re: Delinquentes]
    #5353719 - 03/01/06 02:15 PM (17 years, 10 months ago)

It sounds like you are using steel cake pans.


--------------------
"The price of meat has just gone up,
and your old lady has just gone down!" ~~ Zappa



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Invisiblejmg5
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Re: rust? [Re: Delinquentes]
    #5353722 - 03/01/06 02:16 PM (17 years, 10 months ago)

yup my mistake they're steel baking trays.


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OfflineFraggin
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Re: rust? [Re: Delinquentes]
    #5353726 - 03/01/06 02:18 PM (17 years, 10 months ago)

Aluminum corrodes when it comes in contact with other metals. That is why you will never see aluminum fastened to any other type of metal unless there is a rubber or similar spacer between the two. Aluminum can also corrode from heavy metals in soild. And, mycelium also corrodes aluminum. So to reiterate, aluminum corrodes, it doesn't rust.


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OfflineDelinquentes
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Re: rust? [Re: jmg5]
    #5353728 - 03/01/06 02:19 PM (17 years, 10 months ago)

Well then. Lesson learned. My guess is that the rust will not hurt. I would then clean the pans (after last flush) and then coat in aluminum foil for the next time. I wouldn't throw them away.


--------------------
"The price of meat has just gone up,
and your old lady has just gone down!" ~~ Zappa



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Invisiblejmg5
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Re: rust? [Re: Delinquentes]
    #5353800 - 03/01/06 02:47 PM (17 years, 10 months ago)

Thanks for the input, guys, most likely nothing to worry about.  Even if it was the worst that could happen is I'd poison myself  :grin:

Have a nice day :gethigh:


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Offlinegourmetgrower
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Re: rust? [Re: jmg5]
    #5353893 - 03/01/06 03:18 PM (17 years, 10 months ago)

Line those trays with foil and they probably won't rust.


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OfflineJaicen
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Science lesson ;) [Re: jmg5]
    #5353921 - 03/01/06 03:26 PM (17 years, 10 months ago)

Since there's enough Iron in your blood to make a whole heap of nails, I'd say you can happily consume some iron oxide. It'll be converted to Fe ions in the stomach, and whatever isn't absorbed into the blood will likely be converted to Iron Chloride or similar salt and passed in your stools. Apparently it makes your poo black :wink:
With regards to aluminium (Note the correct spelling :wink: ), when attached to a less reactive metal such as steel (yes really), ions are drawn from the Alu to replace those lost as the steel rusts, hence the corrosion. Freight ships can often be seen with giant chunks of zinc bolted to their hulls, as the salt water combined with a steel hull can act like a battery cell, rapidly drawing away electrons and rusting the hull. The zinc prevents this by 'donating' its electrons, after which it can be replaced.


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OfflineDelinquentes
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Re: Science lesson ;) [Re: Jaicen]
    #5353948 - 03/01/06 03:37 PM (17 years, 10 months ago)

Quote:

Jaicen said:
aluminium (Note the correct spelling :wink:




LOL!  Spell it like the British pronounce it.  I prefer the sound of it, actually.


--------------------
"The price of meat has just gone up,
and your old lady has just gone down!" ~~ Zappa



Click Here for a ghetto ozone generator Tek.

Want to learn more about ozone as a bacteria killer?  Click Here


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OfflineFraggin
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Re: Science lesson ;) [Re: Jaicen]
    #5354005 - 03/01/06 03:56 PM (17 years, 10 months ago)

Quote:

Jaicen said:
Since there's enough Iron in your blood to make a whole heap of nails, I'd say you can happily consume some iron oxide. It'll be converted to Fe ions in the stomach, and whatever isn't absorbed into the blood will likely be converted to Iron Chloride or similar salt and passed in your stools. Apparently it makes your poo black :wink:
With regards to aluminium (Note the correct spelling :wink: ), when attached to a less reactive metal such as steel (yes really), ions are drawn from the Alu to replace those lost as the steel rusts, hence the corrosion. Freight ships can often be seen with giant chunks of zinc bolted to their hulls, as the salt water combined with a steel hull can act like a battery cell, rapidly drawing away electrons and rusting the hull. The zinc prevents this by 'donating' its electrons, after which it can be replaced.




These giant chunks of zinc you refer to are called sacrificial plates or sacrificial anodes. The theory is that the corrosion will attack the zinc and leave the more valuable hull undamaged. Or, to quote the Institute of Marine Engineers "Cathodic protection - Electrolytic system to protect metal from corrosion by providing an electric current neutralizing the current naturally produced in the corrosion process. Current may be provided by sacrificial anodes or through incorrodible anodes in an impressed current system. The electric circuit is completed through the corroding medium to the cathode, the metal to be protected.


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