![Huh ? :?](./images/smilies/huh.gif)
The solution is green pH7 colour according to the chart. When added to
Tap water pH6 yellow
Deionised water is pH6 yellow
Sodium hydroxide wont go to pH11 purple but pH11 blue??
![Embarassed :oops:](./images/smilies/icon_redface.gif)
Can anyone explain or having the same problem?
The colours are not matching the charts..... (same brand even)???