Mug question?

I received a 'black' mug from my son as a Xmas tree present and he told me to make a hot drink in it, does anyone know the coating used to make this happen? he even got a couple of my photos put on it (via Mrs S) I am intrigued.

 

So its a thermal coating and the picture only appears when it is hot ?
That is bloomin clever ! My best guess is its magic

 

They use thermochromic ink. Similar to the coloured flat thermometers. So when the temperature changes the colour changes. In the case of the mug I would think that they put the picture onto the cup (nice picture) and then cover it with a black coating that goes transparent above a certain temperature.
I have seen fabrics dyed with this type of compound and they change colour with body temperature.

 

Now this is brilliant Strongy,what a fabulous present

 

Love the present strongy

 

love it!

 

Thanks Nigel, I thought someone here would know.
The photo is of a Little Bee Eater (same as the Avatar) and the other side is a Lilac Breasted Roller from our '12 Safari.

 

Next time you make a cuppa, can you show us the other side please?
Jenny

 

that is proper cool.

If i had a mug like that i might even have to start drinking hot drinks

 

Winner of GC's word of the week

 

You drink cold tea and coffee!!??

 

I drink cold tealess tea and cold coffeless coffee

Altho just remembered iced tea is lovely

 

No tea or coffee? Which begs the question - how do you survive!!??

 

Looooollll!!! I dont know how to answer that i only ever have the odd tea at my parents if im hungry to put me off food as i dont like it

Water does me just fine. No need for caffeine

 

No as strongy says, it only works when its HOT.