The white backdrop makes testing much easier to see vs. black testing stones.  A must have for silver collectors.

Each bottle has 1/2 fl oz of acid. The sturdy plastic bottles maximize safety and allows the user to easily squeeze out one drop at a time. You receive: 

Two bottles of silver testing acid. 

PuriTEST Premium 2x2 White PRO Touch Testing Stone for Gold, Silver & Platinum Jewelry Testing