API kH test kit

[Chris C]

Hi,
I always wonder if I'm doing it the kH test right. So the instruction says observe the colour changes from blue to yellow. Mine always turns out to be this greenish yellow, but never is as "yellow" as a zero NO3 test reading. Has anyone experienced similar thing?

 

[AdamNC]

When I was using API it would turn yellow at about 8-10 drops. How many drops are you putting in?

 

[Randy Holmes-Farley Verified Community Expert]

If you have a pH meter, you can judge the pH of the endpoint better than by color change. When you hit the low 4's it is done (say, pH 4.2 to 4.5).

 

[Chris C]

When I was using API it would turn yellow at about 8-10 drops. How many drops are you putting in?

8-10 drops as well. Was yours in a bright yellow colour?

 

[AdamNC]

I'd say a med yellow but definitely no green tint at all.