What is Magic Sand?

Magic sand is water-repellent sand available in blue, green and red colours. When this sand in powder form is sprinkled on water, it sinks and forms a solid substance. This property is used to separate oil floating in the oceans – it can be sprayed on oil spills to enable it to mix with oil and take solid form. It is also used by utility companies in Arctic areas as it never freezes.

From Wikipedia

Magic sand, also available under other names, e.g. Mars Sand or Space Sand, is a special type of hydrophobic sand. It can be blue, green, or red in color. Magic Sand was originally developed to trap ocean oil spills near the shore. This would be done by sprinkling Magic Sand on floating petroleum, which would then mix with the oil and make it heavy enough to sink. However, due to the expense of production, it is not being used for this purpose. It has also been tested by utility companies in the Arctic areas as a foundation for junction boxes, as it never freezes. It can be also used as an aerating medium for potted plants.