Abstract
Objective
The aim of this study was to evaluate by Central Composite Design the influence of coloring agents in lipstick color, expressed by L*, a*, b* parameters (CIELab system) where L* indicates lightness, a* and b* are the chromaticity coordinates. The a* indicates color direction from red to green and b* from yellow to blue.
Methods
Lipsticks were formulated as described by Dwivedi et al. (2009). The combined effect of three variables (dye, pigment and opacifier) was evaluated by different formulations in a Central Composite Design. Color parameters (L*, a*, b*) were analyzed by reflectance spectrophotometry. Lipsticks were characterized by visual analyses and melting point.
Results
All formulations were integrate and homogeneous. The pigments and dye do not influence in color transfer neither in melting point of lipsticks. On the other hand, results indicated that variables studied show influence only in parameter b*, whereas for L* and a* values there was no significant difference (p< 0.05).
Conclusion
It was possible to verify, that only the color parameter b* was influenced by the variation of coloring agents concentrations in lipstick formulation, leading the production of the color ranging between violet and light red. Such results are useful for developing new lipsticks formulations in order to obtain the desired color in the final product.
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