Red Litmus Paper
Product Code : SCL-CL-11607
Red Litmus Paper (SKU SCL-CL-11607) is an indicator paper for detecting bases: an alkaline solution turns it blue, while acids leave it red. It is one of the first reagents students meet in school science and remains a quick bench test in college chemistry. Science Lab Supplies sends the paper from Ambala, India to schools, colleges, polytechnics, tender contractors and distributors who need it in class or bulk quantities.
Specifications
The test works by a single colour change. When red litmus paper is dipped in a base, it turns blue; in an acid it shows no change and stays red. Paired with blue litmus paper, it lets students sort any solution into acidic, basic or neutral in seconds.
| Parameter | Value |
|---|---|
| SKU | SCL-CL-11607 |
| Type | Indicator test paper |
| With bases | Turns blue |
| With acids | Stays red (no change) |
| Typical pairing | Used with blue litmus paper |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for Red Litmus Paper
Red litmus is the standard first test for alkalis such as lime water, soap solution or ammonia. It appears in NCERT Class 7 and Class 10 acid-base activities and in Class 11–12 salt analysis, where moist paper held at the mouth of a test tube detects an alkaline gas.
- NCERT Class 7 science: finding the bases among household solutions.
- NCERT Class 10 science: testing sodium hydroxide solution and other alkalis with indicators.
- Class 12 salt analysis: confirming ammonia gas, which turns moist red litmus blue.
- General chemistry labs: checking that alkaline waste or rinse water has been neutralised.
Standard Scope of Supply
Red Litmus Paper is supplied as indicator test paper as described above, with the pack form and number of strips per pack given on the quotation. Shelf life depends on the chemical, its grade and storage conditions; ask us for the expiry date of the batch you are quoted.
Packing, MOQ and Lead Time
Ask for a quotation for a single pack or for enough paper to stock every practical room in a school. The quotation shows packing, delivery time and price for that quantity, and blue litmus or other chemistry lab equipment in India can be added to it.
Holding an Importer-Exporter Code, Science Lab Supplies as a registered exporter can ship to buyers in Rwanda, South Africa, Qatar, Sri Lanka, Vietnam and Malaysia. Enquiries go through the contact page or the enquiry cart, and institutional tenders are covered on the lab tender page.
Frequently Asked Questions
What does red litmus paper detect?
It detects bases. The paper turns blue in an alkaline solution, while in an acid it stays red, so it is the quickest way to confirm that a liquid is basic.
Why does red litmus stay red in some solutions?
Acids cause no change, and neutral substances such as pure water do not change it either. Test with blue litmus as well to tell an acid from a neutral liquid.
Who supplies Red Litmus Paper?
Science Lab Supplies supplies this indicator paper from Ambala, India, and quotes it alone or together with other indicators, glassware and apparatus for the same laboratory.
Can red litmus paper be used to test gases?
Yes. Moisten a strip and hold it at the mouth of the test tube; an alkaline gas such as ammonia turns it blue. Carry out such tests under teacher supervision.
Related Acid-Base Testing Supplies
These four items round out acid-base testing with red litmus: the blue paper for acids, universal indicator for approximate pH, a kit of acid-base classroom activities and a dropper bottle for applying test solutions to the paper. They can be quoted on one document.
- Blue Litmus Paper — detects acids by turning red.
- Universal Ph Indicator — colour scale across pH 0–14.
- Acids and Bases Kit — ready activities on acids and bases.
- Glass Bottle, with Dropper 60ml — holds test solutions for dropping onto the paper.
Browse the full Chemistry Lab range or all school lab equipment.
Last updated: 25 September 2026
