SS1 Chem pH test easy quest.

if u put the pH paper to the solution, the solution is contaminated by the substances on pH paper (that is universal indicator)
if u want to carry other tests to the solution, the results may be affected by that.

it is better to dip the solution to the pH paper with a clean glass rod or a clean dropper

The reverse is better because you donot want to contaminate the test solution . It will be used for other purposes .