Potassium Iodide-Starch Test Papers
Detects  Oxidizing agents.
The paper will turn blue in the presence of oxidizers
when wetted with weak hydrochloric acid (RE2301).
Test is performed on a watch glass (HW4072)

Partial list of substances that the paper can detect:

ammonium dichromate aqueous solution, solid, is a DOT oxidizer
ammonium persulfate aqueous solution, solid, is a DOT oxidizer
barium hypochlorite
benzoquinone is not DOT oxidizer, is a flammable solid
bromine in aqueous solution
bromine, chlorine or iodine dissolved in organic solvents, eg., carbon tetrachloride, ether and ethanol
calcium hypochlorite solid or aqueous solution (pool shock)
calcium nitrite
cerium oxide solid, technical grade, – not a DOT oxidizer – inert
chlorine in aqueous solution, gaseous form
chlorocyanurate, cyanuric acid
chromate salt aqueous solution, solid
chromium oxide
chromium trioxide
cobalt iodide
cobalt salt
cobalt thiocyanate aqueous solution, solid, not a DOT oxidizer
copper acetoarsenite Solid, pesticide, not a DOT oxidizer, “Paris green”
copper iodide
copper salt copper carbonate, copper chloride,
copper sulfate aqueous solution, solid – not a DOT oxidizer
ferric chloride aqueous solution, solid
ferric nitrate
gold chloride surprisingly gold is a stronger oxidizer than iodine
hydrobromic acid yellow or brown solution (color most likely due to dissolved Br2)
hydrogen peroxide
iodine
iron salt
lithium hypochlorite
lithium nitrite
manganese salt
methyl ethyl ketone peroxide MEKP – (organic peroxide)
nitric acid > 20%
piranha base mixture of hydrogen peroxide and ammonia
platinum chloride aqueous solution
potassium chlorate Solid that has become exposed to heat or has “aged” in storage
potassium chromate aqueous solution, solid
potassium dichromate aqueous solution, solid
potassium ferricyanide aqueous solution, solid
potassium iodide
potassium monopersulfate
potassium nitrate solid that has become exposed to heat or has “aged” in storage
potassium nitrite
potassium permanganate solid or aqueous solution
prague powder curing salts containing ~ 6% sodium nitrite – not a DOT oxidizer
silver iodate
sodium hypochlorite solid or aqueous solution (household bleach)
sodium isopropoxide
sodium nitrite
sodium perborate aqueous solution, solid
sodium percarbonate aqueous solution, solid
sodium persulfate aqueous solution, solid
tincture of iodine
trichloro-s-triazinone
vanadium pentoxide