Ina Sava Gallis shows a sample of an optical tag with the Sandia logo under an ultra violet light. (Photo by Craig Fritz) A high-tech invisible ink invented at Sandia National Laboratories could ...

Q: What's the secret to invisible inks? A: The essence is two reagents that produce a color, such as a colorless solution that chars with application of heat or darkens with addition of lemon juice or ...

A novel invisible ink tattoo technique may improve long-term quality of life and emotional well-being for people with cancer who undergo radiation therapy, according to study results. Radiation setup ...

EFFINGHAM COUNTY, Ga. (WTOC) - In this Summer Science experiment students at Effingham College and Career Academy show us how to create invisible ink using a lemon. - When the lemon juice is heated a ...