wrote:
I have noticed that when I burn wood it leaves little ash but
when I burn mostly tree bark, that it leaves a volume of ash
that is about 5 times greater than wood. -=-

$$ Your bark is 5 times worse than your bite.
$$ Your bark burns about 5 times less efficiently than your wood.
$$ Perhaps this helps. ```Brian A M Stuckless, Ph.T (Tivity).

-=- I have asked this question before with no
answer. What is the element or chemical compound in tree bark
versus tree wood that explains this difference. Is it potassium
that the potassium compounds are metabolized into the bark.

Archimedes Plutonium www.iw.net/~a_plutonium
whole entire Universe is just one big atom
where dots of the electron-dot-cloud are galaxies
element or compound in tree bark that it burns with too much ash.