Sparkle Drops Mermaid Glass, Heat Colour Changing Gin Balloon

I thought it came blue and turned purple with heat but it is the other way round and have to run under an extremely hot water tap to turn it blue. Heat from your hand would never get it to change colour.

Expensive for what it is, think its worth no more than £ 10 really, was going to send it back but can't be bothered, the glass takes a very long time to change colour too.

Broke when arrived