OPI green label is not B3F

As I was doing research on the whole B3F subject, I found an old newspaper article about the use of dibutyl phthalate (DBP) in nail polishes. The European union has banned the use of this chemical in 2004, and has forced OPI to remove the chemical from their formula on the European market. However, OPI stated that they would not change the formula in the US, since the chemical at the time was not banned by the FDA.

This sparked my interest in the differences in formula between the different markets. Being from the Netherlands, I used to fork over 13.50 euros for one bottle of OPI. Now that I live in the US, I only pay $8.50. I always thought this was just a clever marketing strategy, the result of exchange rates, and export costs (since OPI polish is made in the US). Now I am actually thinking there might be more to it.

I wanted to compare the ingredients between the US nail polishes, and the European ones. Luckily I still have a bottle of one of my favorite colors, Rosy Future, which I bought in Helsinki, Finland in 2006. I also have a backup bottle of this color, bought here in the US just last month. Both of them have the green label, which always was thought to be B3F. Needless to say, I was shocked to see that it in fact was not!

On the left is the US version, on the right the European version:


As you can see, the production code on the label is different:


And the ingredients are quite different too -- toluene is the top ingredient in the US version:


Might it be that the difference in formula has something to do with the dramatic price differences? And how come the green label in the US has toluene? OPI you have some explaining to do..