Six months ago, an experimental readout looked consistent. The laboratory recorded its method, retained the instrument files, and documented the material it had used. Now the team repeats the work with a newly delivered lot of the same name

A certificate of analysis written in Spanish usually opens with a reassuring line: Pureza: 98% . Readers in Costa Rica see it on supplier pages, in PDF attachments and in WhatsApp screenshots, and most of them stop reading right there. That