New answers tagged fermentation
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It will be safe to use and non-toxic. The maximum lead content is a maximum, and the one specified here is within safe limits. Breathing the air downwind from a coal-fired power station typically exposes you to more lead than this stuff, when used in the regular amounts.
One Campden tablet typically contains 0.44 g each of sodium metabisulphite (plus filler/...
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I believe the weight of CO2 expelled pretty much exactly explains the change in weight and so in specific gravity. My 23 litre (30 bottle) wine bucket started with an SG of 1.074 so would have weighed 24.7kg (54.4 lbs). If it finishes at an SG of 1.000, it will then weigh 23kg so will have lost 1.7kg (3.7 lbs) of CO2.
Volume is slightly trickier. One Mol of ...
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Aeration/agitation will rouse sleepy yeast, like swirling to restart a stuck fermentation.
Secondary infection seems unlikely at this point since the yeast already ate all the low hanging fruit. If it is biological activity (making the CO2) the organisms were already there. You'd have to add a TON of bugs to get an immediate airlock bubble response.
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