whats the lot
#test-results 2024-12-10
Tuesday31 messages8 participantstimes are UTC
Highlights from this day
- batch_bandit — i told GGPeps about a result they would not have liked and they did not argue. credit where it is due 13:54
- plus_sixteen — a single sample tells you about a single vial. that is genuinely all it tells you, thats just me 16:50
- invoice_mismatch — a result without a lot number and a purchase date is an anecdote with a pdf attached, i have it written down somewhere the honest limits: hobby chain of custody is… 18:31
- VialBot — Verification log updated: MKM — evidence added, status unchanged. 18:32
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem
i told GGPeps about a result they would not have liked and they did not argue. credit where it is due
❤️1
attach the pdf
ok so update from 9 months ago: retested the same supplier, result came back better, logged both
i had a result i am fairly sure was a handling error on my side and i logged it as such
log the lot number
log the boring results too. a channel that only records failures produces a false picture
selection bias
one data point
how many lots do you need before you can say anything about a supplier
underfill is more common than impurity. if you only test purity you are testing the less likely failure
i have never regretted spending the money on a test. i have regretted not testing twice
i test roughly every tenth vial. it is a sampling strategy, not paranoia
sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm
which lab
thats not great
if the vial has been through a bad transit you are testing the transit as much as the supplier
a single sample tells you about a single vial. that is genuinely all it tells you, thats just me
💀12🧪4
whats the underfill rate people are actually seeing
weigh it first
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
a result without a lot number and a purchase date is an anecdote with a pdf attached, i have it written down somewhere
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
🎉4
Verification log updated: MKM — evidence added, status unchanged.
certificate said 98.6 and the independent came back 98.1, is that a problem
if you are testing to settle an argument you will not settle it with n of 1
nice result
whats the worst result anyone has logged and what happened next
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
if you are testing to settle an argument you will not settle it with n of 1