This is 100g of Potassium Bromide from Photographers' Formulary. It is commonly used as a restrainer in developers, especially those containing hydroquinone, pyrocatechin, or pyrogallol, and helps to prevent fog during development. When used in paper developers, it also reduces contrast and provides a warming effect. Additionally, potassium bromide is used as an ingredient in intensifying and reducing toners, as well as a variety of other photographic solutions.
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Haven't used it yet as I still need pure vitamin C without the citrus flavoring but looking forward to giving caffenol a try. The formulas I have found reccomend a gram of Potassium Bromide for higher speed films. Glad Photographer's Formulary makes it, along with other chemicals, and that B&H carries it.
I'm not equipped to assay purity, and I don't know how else one could meaningfully review a chemical... The price didn't seem unreasonable.