Barium Sulfate (BaSO4) 375 grams (98.5% Purity 0.7 micron CAS:7727-43-7)

NOT FOR HUMAN CONSUMPTION

Note: the loonie in the photo is just for size reference (not included).

Barium sulfate is a remarkable substance that has many applications, including:

1. Heat-reflecting white paint. Barium sulfate is highly reflective of a broad spectrum of light, including visible light (such that it appears very white when used as a white pigment for paints), plus infrared and ultraviolet. Recently, researchers have successfully explored using it as an ingredient in paint that reflects greater than 98% of all solar radiation, thus cooling surfaces to which it has been applied (see also the YouTube video below).
2. Radiocontrast agent. Barium sulfate in suspension is often used medically as a radiocontrast agent for X-ray imaging and other diagnostic procedures.
   
3. Pyrotechnics (a niche use): barium compounds emit a characteristic green light at high temperatures.

We are quite intrigued by its application as a heat-reflecting paint to save energy and cost, such as the following rather inspirational video:

For those interested, below are some detailed specs from our supplier: