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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—
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.]