Shirts I came across on vacation

[ramy 3]

Was down in Florida last week, and I went into a shop that had shirts with black and white graphics, but when you took the shirt outside in th e sunlight, then colors where displayed and when you took them out of sunlight they went back to black and white.

I'm not sure whether they were screen printed or not, but has anyone seen this and if so, know what products were used?

Thanks

[odokie 8]

I saw these at a local Shopko store.  I was going to pick one up for my son but they only had small sizes left. 

[Buggie Pilot 4]

This would be photochromic ink and I'd love to try it but it's expensive  ( from what I'm told almost $300/gallon   )

[stormy 5]

Saw these stores on vacation in Alaska. Del Sol was the brand name. Not just shirts but many products.

[hockeygirl 30]

Yeah, I have a hoodie from them that's embroidered, and the embroidery changes color with UV lights too. And love their nail polish... it's fun!

[tbenefi33 0]

Here a little bit of info on the ink http://www.chemsong.com/silk.htm

[TruckDriver 0]

Check this out:

http://www.unionink.com/specials/photochrom.html