
Blacken
Physical Change
Use 'blacken' to describe something turning dark due to physical changes like burning or dirt.

The toast blackened in the toaster.
No Gradual Shade
'Blacken' suggests a significant change in color, not a gradual darkening.

The paper quickly blackened around the edges.
Damage Implication
Using 'blacken' often implies damage, not just a change in color.

The firecracker blackened the mailbox.
Compare with
BesmirchDefameSoilStainSullyTaintTarnish
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