the widest spread in my data is about 2.6 percentage points across five lots from one supplier
#test-results 2026-04-20
Monday16 messages5 participantstimes are UTC
Highlights from this day
- VialBot — New independent result logged — JEEP, lot A-2601, purity 96.8% (VendorInvestigate). 23:22
- ms_ms_mira — my sheet has 8 lots from JEEP with a spread under a point, which is tight 23:39
- adelaide_assay — what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern weigh the vial before you reconstitute. it costs nothing… 23:49
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
quantity testing is usually a separate line item and it is the one worth paying for, take that with a pinch of salt
New independent result logged — JEEP, lot A-2601, purity 96.8% (VendorInvestigate).
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the results in this channel skew because people test when they are suspicious. that is selection bias and it is real
if you are testing to settle an argument you will not settle it with n of 1
the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
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sorry to jump in a result without a lot number and a purchase date is an anecdote with a pdf attached
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log the boring results too. a channel that only records failures produces a false picture, ask me again in a month
a point or two between the certificate and an independent result is inside what two labs disagree by
my sheet has 8 lots from JEEP with a spread under a point, which is tight
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
test it again
thats not great
i test roughly every tenth vial. it is a sampling strategy, not paranoia
what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern
weigh the vial before you reconstitute. it costs nothing and catches the common failure