Overall recommended test:
The microcrystals observed for the three reagents discussed are not suitable for IR microspectroscopy. For microcrystalline test, the platinic chloride reagent mixed with acidic solutions of the substance is recommended.
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25B-NBOMe in 5% Aqueous HAuCl₄
25B-NBOMe in 5% HAuCl₄ in 1:2 concentrated H₂SO₄: H₂0