These are my new business cards in demonstration, still in use with the thermochrome paint. They are now in 600gsm mohawk paper/luxe cards which give an extra strength to take the paint provided over the cards. There is also a new design to them.
The thermochromic paints will not reveal a clear white background as the card on the left, but it will still provide a clean outcome and appreciation to the overall outcome when done right.
It was very cold in the room and my hands were freezing in case you wonder how I turned it back to black.