#test-results 2025-06-17

one bad test does not condemn a supplier. one good test does not clear one. both halves get ignored equally

i told BCH about a result they would not have liked and they did not argue. credit where it is due

log the boring results too. a channel that only records failures produces a false picture

the widest spread in my data is about 2.6 percentage points across five lots from one supplier

weigh the vial before you reconstitute. it costs nothing and catches the common failure

quantity testing is usually a separate line item and it is the one worth paying for

nice result

i had a result i am fairly sure was a handling error on my side and i logged it as such

assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem

does anyone log the negative results, the boring ones

the results in this channel skew because people test when they are suspicious. that is selection bias and it is real, your mileage will differ

a supplier disputing a result is rare here and it has never gone well for the supplier

sample handling on your end absolutely affects it. draw cleanly, ship fast, do not let it sit warm

update from 26 months ago: retested the same supplier, result came back better, logged both

my read after three years of this: purity is mostly fine across the market and fill consistency is where suppliers differ

when did you buy it

my sheet has 5 lots from QYB 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, i have it written down somewhere

Archive lookup: ten_of_ten first appears in this channel on 2025-02-17.

has a supplier ever disputed a result posted here

if the vial has been through a bad transit you are testing the transit as much as the supplier

whats the lot

what interests me is when the gap goes the same direction every time. once is noise, three times is a pattern

log the lot number, happy to be corrected

*VendorInvestigate not the other one

coming back after 23 months with a follow up result, where do i put it

underfill is more common than impurity. if you only test purity you are testing the less likely failure

i test roughly every tenth vial. it is a sampling strategy, not paranoia

i have never regretted spending the money on a test. i have regretted not testing twice