A permanent dot mark visually penetrates into the bottle

Underground creator Arnel Renegado has created an effect he calls INFECTIOUS. The effect is simple you draw a permanent dot mark on a glass or plastic bottle and rub the bottle to create heat, mysteriously the ink penetrates inside the bottle making the water changes its color, you are in for a treat to learn the secret now!

HAND THE BOTTLE FOR EXAMINATION
EASY TO DO AND PERFORM
ANY BOTTLE
NO CUTS
NO STICKY STUFF