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1). Irreversible temperature sensitive ink Irreversible temperature sensitive ink includes coloration ink and
discoloration ink. Irreversible coloration temperature sensitive
ink is colorless in appearance but shows colors after being heated
and can’t restore colorless once again after cooling off. The
original color of Irreversible discoloration temperature sensitive
ink can be changed into another one and it can’t restore its
original colors after being cooled once again. (2). Reversible temperature sensitive ink Reversible temperature sensitive ink includes three kinds:
coloration, fading and discoloration ones. Reversible coloration
temperature sensitive ink is colorless in appearance but shows
colors after being heated and can restore colorless after being
cooled. The original color of reversible fading temperature
sensitive ink disappears after being heated and it can restore its
original color after being cooled. The original color of reversible
discoloration temperature sensitive ink can be changed into another
one and it can restore its original color after being cooled. | |||||||||||||||||||||||||||||
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