An Ankoù
Landlord.
That temperature range, both maltsters say, is to reduce the chance of insect infestation. Nothing to do with freshness. Home brewers don't "warehouse" sacks of malt, they tend to keep it in sealed containers where insects fear to tread. It's much easier for home brewers to control humidity, which is what really affects freshness.I doubt very much any home brewer will keep the grain at the temperature (5-15C) and conditions they recommend.
Your links:
Simpsons say whole malt is good for a year and crushed is good for 6 months (why exactly half? Why not 7 or 5 months?). Crisp say their whole malt is good for two years. All a bit arbitrary, innit!
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