What do the colors of the caps on pool chemicals mean? They are all the same across brands.

[Skenn81]

Like why are the chemicals related to testing your pH red and the cholerine ones yellow? It seems like no matter the brand of your test kit or where you get your chemicals from the colors are always the same. Is there a reason everyone follows the same standards? Is it even a standard or does everyone just happen to do what everyone else does? Doesn't matter if its a fancy Taylor test kit or some generic thing from Walmart, they all follow the same color scheme.

 

[proavia]

Are you referring to the testing reagents?
If so. it makes them easy to find for a specific test - especially where more than one reagent is needed to perform a specific test.

Chlorine related tests - yellow
ph - red
TA - green
CH - blue

 

[Skenn81]

Yeah, the reagents. What I am asking though is why the color scheme exists. Is there some root in chemistry that the caps signify or did the original reagent company just pick random colors and that's what we now use?

But now that I am saying it, the ph liquid is blue and isn't the CH one blue? Did I solve it? Color caps based on the chemicals themselves?

 

[mgtfp]

Sounds like you solved it, indeed.

pH test reagent (like Taylor R-0004/14 is phenol red.

TA indicator dye is either pure bromocresol green, which is green in the transition between blue to yellow. Or (as in Taylor R-0008) a mixture of bromocresol green with methyl red which looks green above pH 5.

CH indicator dye (e.g. Taylor R-0011) is hydroxynaphthol blue.

One of the classical FC test reagents is orthotolidine (e.g. Taylor R-0600 in the basic pool test kits) which is yellow.

Kind of makes sense, but interesting that most test kit manufacturers actually seem to have agreed on that colour scheme for the reagent bottles.

 

[duraleigh]

Back in the day, after careful analysis and meetings for weeks, TFTestkits came to the conclusion that all the others were doing it, so why not us?