Salifert test kit? Calcium?

[Notsolostfish]

I get 2 different colors at the end. Barely blue like not clear blue, and if i keep adding drops i get clear blue which one is the correct one for salifert

 

[doubleshot00]

As soon as it starts to change colors thats your calcium level.

 

[Evil1]

I add just one or 2 drops more after a color change just to be sure. The 1 or 2 drops barely affect final reading. I do this with all the salifert test kits.