The color of Ph paper is supposed to change, depending on the Ph level of the liquid you placed it on. The color is dependent as well. When purchasing Ph paper, it comes with a guide on the box. It is best to use that.
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A non used pH paper has a color which depends of the producer. Example for pH-box paper from Merck: brick red for basic, yellow for neutral, blue for acids.
In bases or acids the color is changed; to identify the pH of a solution with a pH paper compare the obtained color with colors on the box label.
The pH test paper that I've seen is generally a sort of pale orange or yellow color before it's used.
This depends on the kind of pH paper.
It Should be about 2
It depends on its nature either it is concentrated or dilluted but most of the time it shows red colour on pH paper
Depending on the type of soil, the value of pH and the type of pH paper. For an acid soil the pH paper from Merck (art. 9565) this color will be probable green.
The paper will become orange in colour.