The Control Paper does not contain any added chemicals, and is simply designed to act as the control in taste test experiments.
Instructions:
Remove one strip of Control Paper from the vial. Stick out your tongue, and place the strip on your tongue. The strip is tasteless, and thus should not stimulate a reaction. Note: The SDS for each taste test paper lists the ingredients. The concentration of ingredients is usually so small, it is less than what would be considered hazardous. Aside from these small quantities, the cellulose paper is the only other ingredient. In addition, the proper use of each taste test is to touch the strip to the tongue. These taste strips have been used safely in classrooms for decades.
The manufacturing facility where the PTC paper is produced (Cottonwood, AZ) is a typical manufacturing site. We don’t manufacture nuts, gluten or other products usually associated with allergy concerns. Please note, however, that the facility is not certified or considered an allergy-friendly manufacturing facility. In addition, the raw materials used in producing the taste test papers are not procured in any special fashion. We have no assurance that they were produced in an allergy-free environment.
Despite the above information, if you have a concern about a possible allergic reaction, perhaps it would be best to abstain from the activity.

Brand : PrecisionLabs