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They are called indicators.
You will have made a pH indicator. Just like litmus paper.
You can use litmus paper or purple cabbage juice to test if a substance is acidic or not. Blue litmus paper turns red under acidic conditions. If you search 'litmus paper chart' online you can find some pretty good charts to find just how acid the substance is.
Lemon juice is an acid therefore, it turns blue litmus paper red and red litmus paper remains red
Blue litmus paper would turn red in orange juice.
Lemon juice is an acid and blue litmus paper turns red when dipped in an acidic liquid.
Neither one is better than the other. Man-made and natural pH indicators do virtually the same exact thing, just with different materials.
The simplest way is to use litmus papers. Acids turn blue litmus paper red; alkalis turn red litmus paper blue. Other ways include the use of indicators such as universal indicator or methyl orange.
Cabbage solution
Which is more accurate- the pH paper or the red cabbage juice and why?