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Litmus Paper Red
Litmus Paper Red (Product Code: SCI-573/148) is an alkali-detecting indicator paper used to show whether a solution or moist gas is basic in school chemistry and biology laboratories. Bases turn the red paper blue, whereas acids and neutral substances leave it red, which makes it the natural partner to blue litmus in any acid-base test. It is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India, as one of its chemistry consumables for teaching labs.
Key Details
| Parameter | Detail |
|---|---|
| Type | Red litmus indicator paper |
| Response to bases | Turns blue |
| Response to acids | Remains red (no change) |
| Response to neutral substances | Remains red (no change) |
| Shelf life | Shelf life depends on the indicator, its grade and storage conditions; ask us for the expiry date of the batch you are quoted. |
| Product code | SCI-573/148 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is Red Litmus Paper Used For?
The best-known use is the ammonia test: warm an ammonium salt with sodium hydroxide and hold damp red litmus paper at the tube mouth — a change to blue confirms ammonia and therefore the ammonium ion. Students also spot-test soap solution, lime water and antacid suspensions to watch alkalis turn the paper blue.
Since acids and neutral liquids both leave it red, one piece cannot tell those two apart; follow a no-change result with blue litmus or universal indicator paper. Tear off a small fresh piece for each test, and keep the pack away from ammonia bottles, whose fumes can turn the paper blue in storage — a common cause of false results with litmus paper in school labs.
Supplier
Red litmus paper is supplied by ScienceLab, the trading name of Jain Scientific Equipments Private Limited, as part of a set of indicator papers and reagents for acid-base teaching. Orders come from schools, colleges, dealers and importers in India and international markets. Read about the company on the ScienceLab profile.
Related Laboratory Equipment
Items that go with red litmus paper in alkali and ammonia tests:
- Litmus Paper Blue — the partner paper for detecting acids.
- Ammonium Chloride — warmed with alkali to release ammonia for the damp-litmus test.
- Litmus Sol Red/Blue — litmus in solution form.
- Watch Glass — holds pieces of paper while drops are tested.
- Litmus Paper (Type Red) — another red litmus listing in the catalogue.
Browse Laboratory Equipment for more.
Frequently Asked Questions
What colour change does Litmus Paper Red show?
Litmus Paper Red turns blue in bases. With acids and neutral substances it stays red, so the red paper answers one question clearly: is the sample alkaline or not?
How is Litmus Paper Red used to test for ammonia?
Dampen Litmus Paper Red with distilled water and hold it at the mouth of a test tube in which an ammonium salt is warmed with sodium hydroxide. Ammonia gas turns the damp paper blue, confirming the ammonium ion.
Why do labs need both red and blue litmus paper?
Litmus Paper Red detects bases and blue litmus detects acids. Using both identifies all three cases: red turns blue for a base, blue turns red for an acid, and no change on either paper means the sample is neutral.
How should Litmus Paper Red be stored?
Keep Litmus Paper Red in its closed pack, dry and away from ammonia and other alkaline fumes that can turn it blue. Shelf life depends on storage conditions; ask us for the expiry date of the batch you are quoted.
Who supplies Litmus Paper Red SCI-573/148?
Litmus Paper Red SCI-573/148 is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India. Schools, colleges and dealers can order it with blue litmus, universal indicator paper and reagents in one quotation.
Request a Quote
Send your requirement for Litmus Paper Red SCI-573/148 through the contact page, where pack quantities are confirmed, or add it to the enquiry cart with other indicator papers.
Last updated: 24 September 2026
