The best replacement for potassium bromide is phenobarbital.

The best alternatives to potassium bromide are rated as following:
★★★★★  phenobarbital

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Speaking about potassium bromide, one probably shouldn't forget about chlorine.

Other search terms related to potassium bromide and their ratings are:

★★★★★ chlorine
★★★ silver nitrate
★★★ sulphuric acid
★★★ concentrated sulphuric acid
★★ chlorine water
chlorine gas
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potassium bromide