chemicals in tree bark compared to wood

I burned tree bark in the fireplace for the past week to see how it burns relative to wood.

But what I noticed most of all is the amount of ash left behind by bark. It is about 3 times more ash than burning wood.

What is in bark that it leaves so much ash behind?

Archimedes Plutonium

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whole entire Universe is just one big atom where dots of the electron-dot-cloud are galaxies

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