You've spammed this in multiple threads. It is highly dubious. Why would kcn be sold in solution? On the industrial or research side, I have ONLY seen it as a solid.
It is fake in almost all likelihood. Shipping liquids is much more difficult than solids, so there is no benefit to the supplier to mix solid kcn into a solution. There are reagents for test for cyanide, and you can research it on your own.
