A three-layer acceptance framework: decision brief, COA-as-identity, and one activity test that actually survives comparison*
If you have ever watched a peroxide reaction go sideways after a "qualified" supplier https://dieselexcavatorsupplier499927.thatgameblog.com/61613572/qualifying-mno₂-for-peroxide-catalysis-without-buying-a-bad-lot-twice