Question about Salifert Calcium Test

ZoaFan08

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The test says to wait for it to go from pink to a clear blue but mine goes from a pink to a dark purple. Is my test bad? Or is the color ok?
 
Are you going slow and doing one drop at a time and swishing it around?
I never really pay much attention to the color to be honest. As long as the change happens I'm happy :)
 
I usually add 50% of what it should be at then do 1 drop at a time
 
Maybe the 50% is not getting mixed in enough, then you have a sudden color change when you do drop at a time - just a thought.
 

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