Hey everyone,
So I posted this before, but I wanted to see if there were more opinions. The Salifert test kit comes with a calibration fluid that is 6.7 dkh. You are suppose to add the titration fluid until it turns "from blue/green to an orange/red or pink color, whichever color is observed first)."
This is my problem. When I use the calibration fluid and add enough fluid for it to be 6.7, it looks very purple.
When testing my tank, I always continue adding until I get a legitimate pink color. The difference between purple and pink is not huge, but it is about 1.0 dkh. Here are some pictures. I added the benadryl so people could compare colors with some kind of constant. The purple is the calibration fluid and the pink is where I test to. Who uses these tests and what color do you shoot for? If I had a different test I'd compare them, but I only have Salifert.