Yes, ashed is in the scrabble dictionary.

What does ashed mean?

v. ashed, ash·ing, ash·es. v.tr. To reduce or convert to ash: ash a tissue sample for analysis. Informal To drop ashes from a cigar or cigarette: accidentally ashed on his own sleeve.

Is ashing a word?

(chemistry) An analytic procedure in which a sample is heated in a furnace to leave a residue of ash, either to determine the gross mineral content, or as a preparation for further analysis.