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When blue litmus paper is placed in a substance that is acidic, it will turn to red. However, if placed in a substance that is basic or neutral, it will remain blue. Blue litmus paper is meant to test only for an acidic pH level.
What Are Acids?
Acids are substances that have a low hydrogen potential, meaning that they will not readily bind with hydrogen molecules. Anything with a pH level of less than 7 is said to be acidic.
Red Litmus Paper
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 pH level. Common acids include include tartar sauce, corn, bacon and beer.
What Are Alkalines?
Alkaline, or basic, substances are those that have a high hydrogen potential, meaning that they will readily bind with hydrogen molecules. Anything with a pH of more than 7 is basic. Common alkalies include tomatoes, almonds and molasses.