Yea, I never had such a distinctive light blue color the guy from video got finally. In my case is blue- violet doesn't matter how much of last reagent I'm putting in. That makes me crazy because I have to wait another half an hour to repeat the test...
Just got one from England with no problem
happened to me too.
No, but I have given up and ordered the reagents to DIY my own potassium test. That last reagent I needed (Polyvinylpyrrolidone) just arrived today. I'll be playing in the basement lab tonight.
Good business if you can make a test kit cause it seems that nobody have any except Red Sea and it take forever and still hard to read
There are three kits that I am aware of (availability aside). In addition to Red Sea and Salifert, there is also an Elos potassium test kit, Of the three, I've only ever used the Red Sea. Based on the scientific literature, and an awful lot of conjecture on my part, I'm pretty sure that they all three use the same fundamental analytical technique for potassium (precipitation of the sparingly soluble potassium tetraphenlborate salt). Elos then basically uses turbidimetry by measuring Secchi depth. Red Sea takes the approach of adding an excess of sodium tetraphenylborate, and then back-titrates the remainder left over after the potassium precipitates, using an indicator dye and a chemical very much like Lysol as the titrant, but because the titrant reacts with the precipitant, that tedious filtration step is necessary. Salifert seems to get away without having to do the filtration step by using another chemical that blocks the reaction between the titrant and the precipitant (that's what I hope to confirm tonight). The Red Sea and Salifert kits probably both use the same indicator dye, but the Salifert approach adjusts the pH to a range where the color change is much more distinct and easier to detect (yellow to blue rather than bluish-purple to blue).
That will be great pls let us know
