Steel About-face Temperatures | Colour Chart
Tempering Colours
| ºF | ºC | |
| 630 | Grey Green | 330 |
| 610 | Grey Blue | 320 |
| 590 | Light Blue | 310 |
| 570 | Wedgewood Blue | 300 |
| 550 | Dark Blue | 290 |
| 530 | Violet | 280 |
| 520 | Purple | 270 |
| 500 | Red Brown | 260 |
| 480 | Yellow Brown | 250 |
| 460 | Dark Yellow | 240 |
| 450 | Yellow | 230 |
| 430 | Straw | 220 |
| 410 | Light Yellow | 210 |
| ºF | ºC |
