Thermo Solid is the second iteration of the Solid series by LotusinHand. This deck features a full solid back made out of thermochromic ink. The technology of thermochromic ink allows the back color to change color from black to chameleon green if heat is applied. The red standard color for the pips and indices of red cards have been changed to chameleon green. The courts main picture is muted to grey. There are two extra cards: one features a joker showing a chameleon in thermo ink, and an ad card showing GET GOOD in thermo ink with an instruction of keeping the thermo ink last long on the back.