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Litmus paper
Indicators can be used to determine if a substance is a acid or a base because of the reaction that occurs between the substance and the indicator. This creates a color change in the indicator (depending on which indicator you use). If it is a universal indicator, the substance may change from deep red to violet. If it is a litmus indicator, it will only turn either red or blue.
yellow
yes,it does
Litmus paper pH paper
phenol red and litmus paper can indicate an acid or base
Blue
Red cabbage or beetroot juice will do the job.
Yes it would
Yes it would
Litmus paper will determine acid or base. Universal indicator paper (pH paper) will give an answer to the nearest whole number.
It is called a rough indicator because it only gives an answer for one of two things: is this an acid or a base. More information will be needed as to what acid or base is it.