Many electronic dictionaries color-code characters according to their tones. The jury is still out on how helpful this really is, but there are a number of different color schemes to choose from.
The Concept
Research
Existing Color Schemes
|
1st Tone |
2nd Tone |
3rd Tone |
4th Tone |
Neutral Tone |
| Dummit |
red |
orange |
green |
light blue |
(none) |
| Pleco |
red |
green |
blue |
purple |
gray |
| Sinosplice |
orange |
green |
blue |
red |
gray |
| Hanping |
light blue |
green |
orange |
red |
gray |
| MDBG |
red |
orange |
green |
blue |
black |
Sources and further reading
Books
Websites
