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How to dissolve benzophenon 4 in water ?
My very lite blue Shower gel turns into coloursless in 2 or 3 months. UV index in our country is very high. To overcome this I tried to add benzophenon 4 . But when I tried to dissolve benzophenon 4 in water, it floats on water like milk powder. Then I add Lactic acid in water to dissolve but failed.
Then I add this undissolved benzophenon and water to my shower gel and stir. But most of them disappear but some white pieces were floating.
My formulation is as follows 🙂
1. SLS 3%
2. AOS 3%
3. SLES (70%) 12%
4. CDEA 1%
5. CAPB active 3%
6. EDTA .2%
7.L A to pH 6.5
8. Glycerine 2%
8. NaCl
9. Perfume .2%
10. PEG 400 .4%
11. Na benzoate .4%
12. Colour
13. Water to 100 % -
2 Replies
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@letsalcido @Pharma
Can you help me regarding this.
I also tried with TEA but it was not dissolved. -
Use benzophenone 5 instead, it’s the even better water soluble sodium salt of benzophenone 4
.But honestly, BP 4 is very soluble in water. But it’s also very acidic and will lower pH. Dissolve it in water, add an appropriate (equimolar) amount of a base such as TEA and that’ll be it.What you observe might be other stuff falling out due to a lower pH (transiently and spatially localised around the dissolving BP 4 particles might suffice for such an effect)?
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