Testing for boron with curcumin (turmeric) - TheHomeScientist
Forensic Presumptive Drug Testing I - TheHomeScientist
Testing for Alkaloids with Dragendorff Reagent - TheHomeScientist
Salicylate determination with visual colorimetry - TheHomeScientist
Synthesis of Dicinnamalacetone - Corrosive Chemistry
Titration of vitamin C with iodometry
Make Potassium Rhodizonate (for lead testing) - NurdRage
Test for Lead Using Potassium Rhodizonate - NurdRage
Rhodizonic acid
https://en.wikipedia.org/wiki/Rhodizonic_acid