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I was wondering if there could be a contam that would not grow in a Karo TEK jar, but when injected into substrate (millet) would then start to grow. And if there is such a contam, could it hurt to empty the syringe of liquid mycelium into some hydrogren peroxide to kill any spores of that contam before I knock up my millet. I'm asking because I have some green growth on a wooden part of a window near my growing area that I just discovered. I bought a HEPA filter to clean out the room but I didn't have it when I did my Karo jar. Thanks.
-------------------- The more I learn, the more I realize how little I know.
My instinct is that a simple sugar medium [karo] will support anything millet will and more. You may be able to see it better on grain, though, because it's a 'dry' substrate where the colored conidia of the mold can develop better.
Peroxide isn't really a means to 'kill spores'. A peroxidated substrate makes spore germination difficult, so that to be effective the mycelium growth must occur in a peroxide environment. Simply adding it to a questionable syringe isn't going to be effective as using the syringe on a peroxidated substrate, because after the questionable syringe is added to the grain, it's no longer in a peroxidated environment. Doesn't sound very clear, does it make sense?
Basically, I'd give the karo a shot as is, and address furthur problems if they develop. Keep a non-innoculated negative grain control just in case.