This phenomenon is specific to the cosmetic grade pink fluo pigments used in the colour formula. What happens? Under the influence of UV light (e.g. from a salon curing lamp or from the sun), the colour of the pigment will temporarily shift to blue.

After exposure to UV light the pigment gradually returns to its original pink colour, and in going so the blue shift gradually disappears whereby it becomes temporarily visible as blue stains until the colour is completely restored.

Usually this is not noticeable as it happens quite fast and the colour returns to it’s original state. In summer time, when the sun shines brighter, the colour absorbs more UV light, so the transition back to the original bright colour is slower (takes longer) and is therefore more noticeable.

Of course there are ways to mask this effect so it is less noticeable when it happens. You can minimize the effect by applying and curing a layer of white under the colour.

This will make the colour even fresher and speed up the polymerization of the fluo. The blue spots will be much less visible after sun exposure and the colour will recover much faster and more evenly.

Great whites to use are:

For the B System: BCOLOUR N°165 “Extreme white”
For the Original Gel System: Gellak N°71 "Bianchissimo"
For the Sopolish Semi-Permanent System: Sopolish N°3 "Pillow White"

Tech Talk n°13 Why do we sometimes see blue spots on fluo colours?

What causes this?

The solution?