Washed Sand —See Sand, Washed.
Water, Ammonia-Free,
H2O—18.02—Use High-Purity Water as defined for Chemical Resistance—Glass Containers under Containers 
661
.
Water, Carbon Dioxide-Free —See Water, in the introductory section.
Water, Deaerated —See Water, in the introductory section.
Water Vapor Detector Tube— A fuse-sealed glass tube so designed that gas may be passed through it and containing suitable absorbing filters and support media for the indicator, which consists of a selenium sol in suspension in sulfuric acid.
Measuring range:
5 to 250 mg per cubic meter.
[note—Available from Draeger Safety, Inc., www.draeger.com, or from Gastec Corp., www.gastec.co.jp, distributed in the USA by www.nextteq.com.]
Wright's Stain
[68988-92-1]—A mixture of methylene blue, methylene azure, and the eosinates of both, available as a solid and as a solution in methanol. Use a suitable grade. [note—If a solid is used, dissolve 6.0 g of Wright's stain powder (CAS# 68988-92-1, dark green powder) and 0.6 g of Giemsa stain powder (CAS# 51811-82-6, dark green to black powder or crystals) in 1000 mL of methanol. Stir overnight, and filter before use.]