Color Stability in Liquid Soap

Water-soluble colors in liquid soap can indeed fade when exposed to heat and sunlight. Finding a suitable additive to improve color stability is a common challenge.

Based on the search, one product that might be relevant is ColorFix™. This ingredient is primarily used in semi-permanent hair color products to help the color adhere better and last longer, resisting wash-off from detergents. It is described as being able to withstand heat and should be stored away from sunlight and heat, suggesting some protective properties.

While ColorFix™ is designed for hair color in a detergent base, its mechanism of helping color stick and its resistance to heat and detergents might offer some benefit in stabilizing water-soluble colors in a liquid soap formula. However, its effectiveness specifically against light fading of general water-soluble colors in soap is not explicitly stated in the description.

Color stability can also be influenced by the specific type of color used and the pH of your liquid soap formula.

Regarding a budget-friendly option, the product description does not provide cost information, so you would need to check the pricing to see if ColorFix™ fits your budget. Testing would be necessary to confirm its effectiveness in your specific liquid soap formula and with your chosen colorants.

Consider testing ColorFix™ as a potential option, keeping in mind its primary application is hair color.