... ink,.reversible temperature coloration ink,and reversible temperature color change ink. reversible temperauter fading ink :after heat it , ... brownish blackb:printing way:screen ,uv screenreversible temperature color change ink :the same effect as abovea:color:red-black,yellow-red,black- ... so on,b:printing way:screen and offset.UV screen, Temperature sensitive ink,heat sensitive ink.color change ink