However, we can see that the green food colouring is a mixture of a blue and yellow pigment. We can tell this because it contains two spots. Four samples of ink were used. Looking at the photo ...

“Most celebrities and athletes are taught not to do blue ink cause you can scan and forge the signature on other things and sell them,” wrote one user. Another added “for computer scanning ...

Scientists at the Institute of Nano Science and Technology (INST) have developed a groundbreaking luminescent ink with advanced security features to combat counterfeiting in currency, certificates, ...