Supertaster test strips for genetics labs, food & drink testing or party fun. PTC, Sodium Benzoate, Thiourea & Blank-Control Test Strips.
The Myths of Human Genetics is an interesting read. It discusses topics that range from eye and hair color to dimples, attached earlobes & more.
The section PTC tasting: The myth, is one of the most detailed we have encountered and is instructive to anyone involved with teaching taste test genetics labs.
To quote the conclusion in brief: ""PTC tasting is largely determined by a single gene...(but) there are other genes or environmental factors that influence PTC tasting. As a result, there is a continuous range of PTC tasting, not absolute separation into tasters and non-tasters. PTC tasting would be a fascinating subject for an advanced genetics class, but it does not fit the one-gene, two-allele myth well enough to be used to demonstrate simple Mendelian genetics."
All test strips are white so for a randomized experiment, mark each type of strip with a unique color code. 2 Ink felt pens could be used to add stripes at one end such as: black/black, red/red, black/red, red/black. Another method (but we haven't tried ) would be to remove the strips & add some food dye to the vial. Put the strips back in & let them soak up the dye. Remove again & set them out to dry.