The best replacement for triiodide is triiodide.

The best alternatives to triiodide are rated as following:
★★★★★  triiodide

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Speaking about triiodide, one probably shouldn't forget about thiosulfate.

Other search terms related to triiodide and their ratings are:
★★★★★ thiosulfate
★★ ascorbic acid
★ thiosulfate reaction
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