I put fire retardant on the fallen leaves.

SOUFA was brushed on the fallen leaves, and after drying it was ignited with an alcohol lamp.
SOUFA gives high flame resistance to cellulose, so it does not burn easily. However, it will burn. As for the fallen leaves, it does not absorb well, and it was played. Therefore, it has soaked through the back surface. It burns. If a large amount of flame retardant is made to soak it, it will become difficult to burn.
As for the flame retardant mechanism, SOUFA settles on the cellulose of the plant and reacts to heat when heat is applied, forming a thin glass film on the cotton surface. At the same time, SOUFA combines with the carbon of cotton to form an oxygen-blocking film.
Therefore, once the cotton gets burnt, it will not spread further. If it is just a brush coating, the texture will not be affected much.
However, if too much is applied, it is thought to become hard. This is because the boric acid has a property of slightly hardening cellulose.

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