Resource Testing SN using the Griess reaction over test strip?

[tooafraidtodiez]

So instead of buying an aquarium test strip, i bought a specific nitrite test kit that uses the Griess reaction. So basically, you get a vial and there are 2 reagent solution bottle. The testing is very simple, you fill the vial with water then mix your SN, drop 7 solution of ReAg bottle 1, wait 10 sec, drop 7 solution of ReAg bottle 2 then close the vial and shake gently. Wait for color change then match color change with the color chart they provided. I got dark brown which isn't in the color chart but that's because i messed up my solution drop (i have fixed it now). According to AI dark brown or deep red is good it indicates that your SN is high purity, also they told that the Griess reaction won't work on non nitrite solution. So let's say you got sodium azide or sodium nitrate the color will most likely stay yellowish pale. Is this method viable? I know it can't fully measure the purity but it can at least tell whether what you have is sodium nitrite or not. What's the advantage of aquarium strip test over this? Any insights is appreciated