does a bad result on one lot condemn the whole supplier
#test-results 2025-08-16
Saturday34 messages8 participantstimes are UTC
Highlights from this day
if you are testing to settle an argument you will not settle it with n of 1
my sheet has 4 lots from WXT with a spread under a point, which is tight, for what its worth
slightly off topic but anyone had a result they think was a lab error rather than a bad vial
thats within range
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*that should say weekly
assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem, take that with a pinch of salt
how do you post a result so it is actually useful to somebody in a year
quantity testing is usually a separate line item and it is the one worth paying for
weigh it first
does anyone log the negative results, the boring ones
a result without a lot number and a purchase date is an anecdote with a pdf attached
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is quantity testing available as a separate thing or bundled
ring_size_downmy sheet has 4 lots from WXT with a spread under a point, which is tight, for what its…
coming back after 2 months with a follow up result, where do i put it
right so i had a result i am fairly sure was a handling error on my side and i logged it as such
sorry to jump in weigh the vial before you reconstitute. it costs nothing and catches the common failure, still working it out
sorry to jump in how do you separate batch variance from supplier variance
has a supplier ever disputed a result posted here
the widest spread in my data is about 2.6 percentage points across five lots from one supplier
i have never regretted spending the money on a test. i have regretted not testing twice
98.6 against a certificate of 98.1 is fine. the same supplier landing low four times in a row is a question
how much does sample handling on my end affect the number
anyone tested the same lot twice at different labs
my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ
do you test every order or sample it
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgring_size_downmy sheet has 4 lots from WXT with a spread under a point, which is tight, for what its…
do the results in this channel skew because people test when suspicious
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the honest limits: hobby chain of custody is weak and any result here should be read with that in mind
[edited]my result contradicts the supplier certificate, do i tell them
selection bias
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log the boring results too. a channel that only records failures produces a false picture
thats a fill problem
post the lot, the purchase month, the lab, the number, and what you were expecting. that makes it useful later
is it worth testing if the vial has already been through a warm transit