one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally
if the vial has been through a bad transit you are testing the transit as much as the supplier
#test-results 2025-11-24
Monday13 messages4 participantstimes are UTC
Highlights from this day
- thirty_min_wait — one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally if the vial has been through a bad transit you are testing… 18:11
- acetate_ash — i told WXT about a result they would not have liked and they did not argue. credit where it is due 19:14
- thirty_min_wait — my sheet has 3 lots from Homopeptide with a spread under a point, which is tight 19:15
my result contradicts the supplier certificate, do i tell them
i test roughly every tenth vial. it is a sampling strategy, not paranoia, your mileage will differ
my vial assayed under label but the purity was fine, which matters more
weigh it first
selection bias
how many lots do you need before you can say anything about a supplier
a result without a lot number and a purchase date is an anecdote with a pdf attached
i told WXT about a result they would not have liked and they did not argue. credit where it is due
❤️10🎉12
my sheet has 3 lots from Homopeptide with a spread under a point, which is tight
😂2🧪4
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
underfill is more common than impurity. if you only test purity you are testing the less likely failure