Each pack contains 100 strips.

Control Paper: Free from PTC, sodium benzoate, and thiourea.

PTC Paper: PTC (Phenylthiocarbamide) paper provides a fantastic first hand demonstration of genetics that your students will never forget. Simply have students place a PTC strip on their tongue, wait, and see the reactions of those who can taste the bitter PTC molecule and those that taste nothing at all! Seven out of 10 people can taste PTC and 3 out of 10 cannot, making this phenomena a fantastic topic for learning the relationships between phenotype and genotype, dominant and recessive genes, and other genetic concepts.

Sodium Benzoate Paper: Paper impregnated with this chemical elicits taste responses of sweet, salty, bitter, or tasteless.

Thiourea Paper: Paper impregnated with this chemical, like PTC, tastes bitter to most people.