
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.