SN test. Does it looks like original thing?

[kufajoy]

I have this sn from a local seller so I'm not sure if it's a real thing. I did a blood test from my own blood by adding a tiny 2 rice size amount of sn and it turned brown after like 20 second. Felt like a little slower right ?

Then I did a nitrite test with a aquarium test kit. Idk much about it. It turned both nitrite and nitrate color from white to pink after immersing in sn water for 2 second. It showing it has higher amount of nitrite and nitrate.

Any idea ?