Mother of Pearl

Image Source: Thelifestylereport.ca
Intent: To create a nail polish that changes color in the presence of certain drugs.
Development Thread: If Necessary
Manufacturer: Heartbeat House
Model: N/A
Affiliation: Closed Market
Modularity: Yes, different colors
Production: Limited
Material: Detrosol, Nitrocellulose, pigment, standard nail polish ingredients
Strengths:
-Covertly detects the presence of most drugs
-Comes in an array of colors including clear
Weaknesses:
-Limited to detection in liquids only
-Must be applied to nails/claws/etc., thus will not work for certain non-humanoid species.
Description:
Covert Colors is a nail polish that detects drugged drinks, aimed at politicians, intelligence agents, or even the average man/woman. Covert Colors works by changing colors in the presence of drugged liquids. Simply dip a nail painted with a Covert Colors polish into a drink and wait a few moments. If the color of the nail begins to change, the drink is positive for a wide array of drugs detected by detrosol, a chemical that tests for most narcotics and deadly drugs. Covert Colors is available in the follow shades:

(Top to bottom)
01-Mulberry, 02-Brickhouse, 03-Fuscia, 04-Navy, 05-Seafoam, 06-Meadow, 07-Magenta, 08-Coral, 09-Petal, 10-Coal, 11-Taupe, 12-Pearl, 13-Clear (not pictured)
When using Covert Colors, the nail polish must be completely dry to ensure testing accuracy. If a drink tests negative for the presence of drugs, the nail polish will remain the same color. If a drink tests positive, the nail polish will turn black with the exception of color 10-Coal, which will turn a light grey. A clear option is also available for those who do not wish to wear a colored nail polish, and will also turn back upon being presented with a drugged drink. The color change begins after several seconds of coming into contact with a positive sample, but takes about 3 minutes to completely cover the nail.
While Covert Colors cannot detect all and every drug, it can detect most common narcotics and deadly drugs including: Norbutal, Slick, Black Hole, Waste-It, Lecepanine, Xabar, and many classes of truth drugs including Loquasin. If one or more of these drugs is present, the detrosol in the nail polish will release a chemical dye that causes the color change to occur.
Primary Source:
Detrosol
Undercover Colors