Temperature sensitive ink

Information:

The most usual temperatures are 27°C and 35°C. With those temperatures it is possible to obtain a discoloration reaction simply by rubbing a finger on the printed area.

Inks can be printed by offset, letterpress, flexography, silk-screen and gravure, and usual colours are grey-black, magenta, and blue.

As a variation, inks can also change of colours according to the temperature selected, and in that case tose inks are called bi-coloured thermochromic inks.

History:

Thermochromic inks or dyes are temperature sensitive compounds, developed in the 1970s, that temporarily change color with exposure to heat. They come in two forms, liquid crystals and leuco dyes. Leuco dyes are easier to work with and allow for a greater range of applications. These applications include: flat thermometers, battery testers, clothing, and the indicator on bottles of maple syrup that change color when the syrup is warm. The most well-known line of clothing utilizing

thermochromics was Hypercolor. The thermometers are often used on the exterior of aquariums, or to obtain a body temperature via the forehead. Coors Light uses thermochromic ink on its cans now, changing from white to blue to indicate the can is cold.

Product Application:

Three types of this ink:   reversible fading ink, reversible coloration ink, reversible discoloration ink.

1. Reversible fading temperature sensitive ink
   Turning colorless in appearance after being heated and it can restore its original color after being cooled.
   1)Temperature: 7°C-13°C, 26°C-31°C, 38°C- 43°C, 46°C-51°C, 60°C-65°C.
   2)Colors: middle yellow-none,  gold red-none,   bright red-none,   rose red-none,  peach red-none,   royal blue-none,shamrock -none,  verdancy-none,  peacock green-none,   blackish green-none,  dark brown- -none  and  black-none
2. Reversible coloration temperature sensitive ink
   Colorless in appearance but take on color after being heated and can restore colorless after being cooled. Screen is advised to use 200 item screen printing form.
   1)Temperature: 60°C.
   2)Colors: colorless-rose red, verdancy, peacock green, blue, dark brown.
3. Reversible discoloration temperature sensitive ink
   The color of this ink will change to another color when the temperature is to the specified degrees and will restore original color when the temperature is down.
   1) Temperature : 7°C-13°C, 26°C-31°C, 38°C- 43°C, 46°C-51°C, 60°C-65°C.
   2) Color : black-red, black-green, red-yellow, green-yellow.
   3) Temperature: 60°C
   4) Color: green- red , blue-red, black-blue, red-blue, green-blue, red-green, blue-green, black-green, red-black, green-black, blue-black.