Why is nail polish a mixture?

ok, I will try and answer what I think you mean.

nail polish is made up of many ingredients, in times gone by, they were laden with chemicals and still to this day, there are some companies still using a lot of harmful chemicals.

Many now like revlon, etc are now making their nail polish without 3 of the most harmful chemicals.

The great thing now is, you can buy organic, natural nail polish which is very good for your fingernails health.