What if we could break down reagents to form lower class reagents? A un-transmute if you will.
For an example: 15 stone blocks can be transmuted into 1 fossil.
What if: 1 fossil could be deconstructed into 10 stone blocks?
This would mean higher reagents that we have no use for could be used to aid us with recipes. You would be able to buy the un-transmute recipes from the same crafting recipes that sell transmute recipes. Opinions?