Colour Changing Polish

Clicking about on ebay the other day to find some new gel colours and I came across some colour changing polish... Surely not I thought to myself so I read some reviews and it seemed perfectly legit. So my first port of call is to tell my sister about them, so we can discuss which of the colours we should try, the next thing I know I am at her front door collecting not 1 but 2 bottles from the postman. She has a bigger ebay problem than me (I am almost sure after trying these colours she has ordered some more)