Supplier says sodium benzoate is incompatible with food colours

I bought some gluconolactone & sodium benzoate preservative(Gluconolactone ~70%, Sodium benzoate ~22%, Calcium gluconate ~1%), and in the information leaflet they provided, it says that this preservative is:
"not for use in products which contain food colours (due to undesirable chemical reaction which may convert the sodium benzoate to its acidic state (benzoic acid)"
- which is odd since I thought that was how the preservative worked and also food colours from the supermarket use sodium benzoate. Though they didn't specify what kind of food colours.

So I'm confused, what does this mean? 
Thanks!

Comments

  • PhilGeisPhilGeis Member, Professional formulator
    That is a poor preservative system and your supplier is profoundly ignorant.  Suggest you look for alternatives to  both.

    Food colors have nothing to do with the acid salt equilibrium that is prmarily controlled by pH in cosmetic systems.


  • PhilGeis said:
    That is a poor preservative system and your supplier is profoundly ignorant.  Suggest you look for alternatives to  both.

    Food colors have nothing to do with the acid salt equilibrium that is prmarily controlled by pH in cosmetic systems.


    Thanks Phil, I'm not sure how they got such bad quality information, which makes me wonder about the quality of their product, rest assured I won't be using this ingredient as the sole preservative.
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