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“We dusted and vacuumed and then mopped—in the order I was taught by my mother—and then used a cleaning solution recommended by the Red Cross,” says Farmer, “consisting of water, trisodium phosphate, and a water-based commercial multipurpose cleaner, which works very well.”

Instead, lab tests found the substance was trisodium phosphate - a compound commonly used as a cleaning agent.

Trisodium phosphate, a white powdered substance, can be used in stain remover, or even as a food additive.

He explained that the mix up had occurred because preliminary tests, which turn purple in the presence of ketamine hydrochloride, react the same to trisodium phosphate.

Somsak Thepsuthin said tests which turned purple in the presence of ketamine hydrochloride reacted the same to trisodium phosphate - a chemical which can be used as a food additive and cleaning agent which is all that had been found so far.