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How can i perform Color stability test on detergents without an actual lab
i saw that some of my liquid detergents started fading after some days and some after weeks im wondering if there’s a way to perform accelerated testing on different formulations
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4 Replies
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You can place samples to direct sunlight, always with a benchmark on the side, as a reference of how much your color should last.
Now, a rapid change as you described doesn’t occurr under normal conditions, so check if something else could be affecting your product. Is there a sudden change in pH as well?
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there’s no pH change my pH was 5.5 its still 5.5 the reason i did that is because anionics foam better at lower pH but the color is stable now in normal conditions i removed the CAPB in my formula it was interacting with my SDBS and salt unfavorably i guess
i saw on youtube that storing the product in the freezer for 24 hours and taking it out was one way to test the color stability
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Anionics foam better at higher pH. It’d be weird that CAPB impairs color stability. Also, putting your sample in the fridge and taking it out does’t make much sense for color (that’s the freeze-thaw stability, but that’s usually done for emulsions). For color fade, you normally expose your product to UV light, that’s why I suggested to put it under sunlight.
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Which type of dyes your’re using? If you’re using cationic dyes, that might be the reason.
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