%HCl Effect on Primary Color Solutions
| Primary color | Sample ID | L* | a* | b* | ΔE 2000 |
|---|---|---|---|---|---|
| Yellow Primary | Fe + 1.5% HCl | 98.9 | –13.02 | 34.51 | 3.84 |
| Fe + 0.5% HCl | 99.13 | –10.48 | 25.55 | ||
| Red primary | Co + 1.5% HCl | 89.39 | 21.64 | 0.35 | 0.21 |
| Co + 0.5% HCl | 89.57 | 21.35 | 0.43 | ||
| Blue primary | Cu + 1.5% HCl | 98 | –6.79 | –3.52 | 0.69 |
| Cu + 0.5% HCl | 98.11 | –6.56 | –3.48 |