100 Red Litmus Paper Strips

SKU: 33810-RV

$2.75USD or lower Each

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Red litmus test paper turns blue when exposed to an alkaline solution; just dip a strip into the liquid & if it is basic, it will turn blue immediately; only $2.75

You can make wider/longer strips using the 200x250mm-8x10" blue litmus paper sheets which can also be used for water leak detection.

If you need more than a simple qualitative (yes or no) answer that a liquid is acidic or alkaline, we supply universal pH indicator paper sheets that are 8x10" (200x250mm).

Use pH4-5-10 test strips if you are measuring weak acids or bases since litmus paper is not very accurate between pH5.5-8.5.

Acidic or Basic Solution?

Litmus paper is a type of acid base indicator that uses a single chemical dye to determine acid or alkali (base) in an aqueous solution. It is not as precise as pH strips which can have multiple indicators of different colors & have a color chart that gives numerical pH values. As you go above pH 7 red paper litmus will undergo a color & turn a shade of purple before turning fully blue at pH 8.3. In this case, it can be referred to as alkaline litmus paper.

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What Turns Red Litmus Paper Blue?

The pH litmus dye chemical, 7-hydroxyphenoxazone, shown below, is extracted from lichens. You can make test solutions or paper by adding it to water or filter paper respectively. It changes from red to blue when exposed to alkaline materials (bases) such as sea water, baking soda, milk of magnesia, ammonia or oven cleaner. You can even build a physical model of 7-hydroxyphenoxazone.

Litmus Dye Structure

Specifications

The image shows the red litmus papers as they are available in both vial & pad; the strips are identical and turn from red to blue when dipped in an alkali (basic) solution.

Test Strip Documentation
Stability Statement Certificate of Analysis SDS
Indigo Red litmus paper-alkali test Stability Statement Indigo Red litmus paper-alkali test Certificate of Analysis Indigo Red litmus paper-alkali test SDS
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Frequently Asked Questions

FAQ for 100 Red Litmus Paper Strips

Litmus paper changes color in response to acidic or basic aqueous solutions & is strictly qualitative (yes or no). pH test strips indicators specific to acidity & or basicity can produce semi-quantitative, estimated, numerical values.

Litmus paper is infused with a single chemical indicator, 7-hydroxyphenoxazone. The paper is usually treated with an acid or a base & sold as red & blue litmus paper respectively. However, if treated with solution near pH 7, neutral, it will appear purple-as expected when mixing red & blue.