Ashes denote that Fire was — Alchemy

Ashes denote that Fire was-1
Revere the Grayest Pile
For the Departed Creature's sake
That hovered there awhile-

Fire exists the first in light 5
And then consolidates
Only the Chemist can disclose
Into what Carbonates.
(F.1097/J.1063)
[1] Ashes:: the remain of alchemy, the conversion of base metals into gold.
[2] Grayest:: the most obscure, imperceptible.
[3] Departed:: given up, surrendered; left behind. Creature:: a result, product.
[4] hovered:: remained, lingered.
[5] Fire:: passion, enthusiasm.
[6] light:: a concept, an idea.
[7] Chemist:: an alchemist, one who tried to transmute baser metals to gold. Only, disclose:: only the alchemist knew what he had put into fire.