Thermochromic Ink reacts to changes in temperature by exhibiting a colour change. These inks are available with a colour change activation at temperatures from -10°C up to +70°C. They are reversible, changing either way as the ink warms or cools.
These temperature reactive inks, also known as leuco dye inks, are a darker colour when colder than their temperature activation point, and lighter in colour or virtually clear when warmer than their activation point.
Uses of these products generally fall into three areas: Cold, Body temp and Hot, and are used to enhance labels, indicate temperature warnings, advise correct consumption temperature, show proof of authenticity or simply act as an interactive mechanism on a wide range of print such as mailers, game cards, book covers and coasters.
For instance, smart or intelligent packaging incorporating thermochromic ink can show when perishable foods are being stored correctly at a cold temperature, or a smart label can show when microwaved food or drink is too hot to consume.
A black thermochromic ink (with body temp activation) screen printed over and obscuring a litho printed image or words, can become clear and reveal the litho image when it is touched or rubbed. A black thermochromic ink with a higher activation temperature can be screen printed onto a coffee coaster, so that the thermochromic ink becomes clear when heated by a hot mug, revealing the message or branding also printed on the coaster.
Or a flexo/gravure printed beer bottle label can have an added thermochromic colour printed on in line, which is invisible at room temperature, but becomes coloured when chilled below its activation temp, eg 6°C, thereby signifying that the beer is now perfectly chilled and ready for drinking.
We also produce colour-changing inks and sprays for glass and ceramic mugs, as well as plastisol and water based textile inks for printing onto fabrics such as T shirts.
Available colours: Black, Red, Blue, Green, Orange and Magenta
Temperatures: Between -10 and 70°C.
We hold a few standard colours however most products are developed to our customers’ needs.