My Dishwash Colour is fading when I put it in direct sun

Dear expert 
Need suggestion 
My formula is

Selfunic 96  7%
Sles 70          7%
Caustic     to ajust ph
Citric acid  2g/kg
Color food lime yellow 
Salt. 20g / kg
Formaline 1g/kg

Your help will be appreciated. 


  • chemicalmattchemicalmatt Member, Professional Chemist
    Food lime yellow? That would be Yellow 5?  
  • ozgirlozgirl Member, PCF student
    This is a very common problem and there are three main options for this problem

    1. Change the colour and use a different dye
    2. Put the product in an opaque or amber bottle
    3. Get a UV blocking additive added to your clear PET bottle. This is more expensive than standard bottles. It is done during manufacture of the bottle and minimum order quantities are generally required.
  • AzizAziz Member
    Quality of Sulphonic acid may lead to an unstable product and result in discolouration which I suffered.  

  • I used food color and somebody suggest me pigment color. Can we use it in dishwash
  • @Rafique If the issue doesn't show up when you put the product away from UV light and If there's no pH drift causing the color fade, then add a small amount of a UV absrober (such as Benzophenone-4...0.05% might work). 
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