These rainbow colored transparent ants are what they eat

From Smithsonian:

Not long ago, Dr. Mohamed Babu, of Mysore, South India, noticed something strange about the ants scurrying around on the floor of his kitchen: After drinking some spilled milk, their abdomens turned white. Realizing the insects’ bodies were transparent, he got an idea for a stunning set of photographs, he told the Daily Mail.

Mixing different varieties of food coloring along with sugar, water and a waxy base, he set out small droplets of liquid on a white plastic sheet outside in his garden and let the ants do the rest. “As the ant’s abdomen is semi-transparent, the ants gain the colors as they sip the liquid,” he said.

More here.