What is need to make blue, red litmus paper although we have original (pink colour) litmus paper?

What is need to make blue, red litmus paper although we have original

1.	What is need to make blue, red litmus paper although we have original (pink colour) litmus paper?
Answer» When red litmus paper is placed into a basic substance, it will turn blue. If it comes in contact with an acidic or neutral substance, it will remain red. Red litmus paper is meant to test only for an alkaline\xa0pH level.\xa0The\xa0blue litmus\xa0will\xa0turn red\xa0or\xa0pink\xa0when it comes into contact with an acidic solution below pH 4.5. Between 4.5 and 8.3 the\xa0paper\xa0will be purple. ...\xa0Litmus paper\xa0is NOT used to determine the pH level of a solution.