LD Di
Hi, ruffneck!
I agree with Moreless on this.
Without a refractometer, one can tell a potato, or any other food is bad when it will decay readily. How prone to decay is INVERSELY CORRELATED with quality.
Check my recent posts regarding gleaning and dead-fall fruit, also my post around 2 yrs ago regarding the longevity of hi brix fuzzy patty pan squash stored without refrigeration.
Keep seeking, applying, sharing accurate knowledge in order to
keep seeking abundant life and joy!
Di