More examples. 1  The police have called off the search for the missing child until dawn tomorrow. 2  The missing letter eventually turned up inside a book. 3  A search party was sent out to look for the missing climbers. 4  All of the ship's crew are missing, believed dead. 5  This jigsaw puzzle has two pieces missing.
A highly concentrated source of boric oxide for glazes. Anhydrous borax is made by burning or fusing hydrated borax. It thus contains little or no water of crystallization (conversation ratio of .53 compared to hydrated decahydrate borax) and does not rehydrate under normal storage conditions. Anhydrous borax is water soluble, but considerably less so than raw borax (in aqueous solution it can provide slow release of boron).
The term borax is often used for a number of closely related minerals or chemical compounds that differ in their crystal water content: 1  anhydrous sodium tetraborate, Na2B4O7. 2  sodium tetraborate pentahydrate, Na2B4O7Â·5H2O. 3  setraborate decahydrate, Na2B4O7Â·10H2O.