Both of those batches I rescued. I took the painter's cap with the brown crunchy test (which had melted into the cap) amd soaked it in methyl alcohol overnight, then crushed it with a fork, and re-filtered the result.
I got 50ml of 100mg/ml "burned test prop", that's how I labeled my bottle.
I made another batch correctly and cycled that, then after PCT on my next cycle I tried the "burned prop" and was surprised to find it still pretty effective, at least 80% (my SWAG) of unburned stuff.