sodium hydrosulfite

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a white, crystalline, water-soluble powder, Na2S2O4, used as a reducing agent, especially in dyeing, and as a bleach.

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Also called hydrosulfite, so·dium di·thi·o·nite

[dahy-thahy-uh-nahyt], /daɪˈθaɪ əˌnaɪt/, sodium hyposulfite.

For example, Kuwait recently put a limit the allowable amount of sodium in bread to lower blood pressure.
The Secret to Tracking Ebola, MERS, and Flu? Sewers|Wudan Yan|November 29, 2014|DAILY BEAST
For all intents and purposes, sodium thiopental is now unavailable in the United States.
Pennsylvania’s Lethal Injection Fiasco|Christopher Moraff|September 18, 2014|DAILY BEAST
Sports drinksSugar and sodium are good things when it comes to sports drinks!
10 Ways to Stay Hydrated (That Aren’t Water)|DailyBurn|July 25, 2014|DAILY BEAST
But for more rigorous sweat sessions, the low-sodium drink does come up short in replenishing the salt your body loses.
10 Ways to Stay Hydrated (That Aren’t Water)|DailyBurn|July 25, 2014|DAILY BEAST

Other measurements on nutrition labels—calories, fat, sodium—are passive: They simply state how much is in the food.
Guess Who Doesn’t Want You to Know How Much Added Sugar Is in Your Food|Tim Mak|July 19, 2014|DAILY BEAST
The metal is then removed, and washed successively with very dilute sodium hydroxid solution, alcohol, and ether.
A Manual of Clinical Diagnosis|James Campbell Todd
This fluid is then heated, adding crystals of sodium acetate until it becomes perfectly clear.
A Manual of Clinical Diagnosis|James Campbell Todd
Rarely, sodium urate occurs in crystalline form—slender prisms, arranged in fan- or sheaf-like structures (Fig. 32).
A Manual of Clinical Diagnosis|James Campbell Todd
Glass rods and tubing of sodium glass: for stirring rods, urinary pipets, etc.
A Manual of Clinical Diagnosis|James Campbell Todd
Sodium and alcohol reduce common camphor to a mixture of d- and l-borneol.
Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2|Various