But… but…. It’s ‘different’. And ‘new’ (to me anyway…) Maybe I’ll try it on a day when I don’t work, just in case.Humans have evolved a very good way to test for fresh/usable food- our senses. If it smells good, looks good and tastes good, then it is fine to eat. Water glassing has been used since the 1800s, so it was around long before modern refrigeration.