Blue Litmus Paper
Product Code : SCL-CL-11606
Blue Litmus Paper (SKU SCL-CL-11606) is the classic indicator paper for detecting acids: an acid turns it red, while bases and neutral substances leave it blue. It suits the first acid-base tests in middle school and quick checks during college chemistry practicals. Science Lab Supplies quotes it from Ambala, India, in single packs or bulk stock for schools, colleges, training centres, tender contractors and distributors.
Specifications
Blue litmus paper's behaviour with acids, bases and neutral substances is set out row by row in the table below. In short, a drop of an acidic solution changes the blue paper to red, while a basic or neutral solution produces no change; testing with red litmus as well separates bases from neutral liquids.
| Specification | Value |
|---|---|
| SKU | SCL-CL-11606 |
| Type | Indicator test paper (blue litmus) |
| With acids | Turns red |
| With bases | Stays blue (no change) |
| With neutral substances | Stays blue (no change) |
| Shelf life | Depends on storage; batch expiry given on request |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for Blue Litmus Paper
The paper answers one question quickly: is this sample acidic? It suits NCERT Class 7 and Class 10 acid-base activities, qualitative tests in Class 11–12 chemistry, and routine checks of rinse water or gases in college laboratories, with no instrument or power supply needed at the bench.
- NCERT Class 7 science: identifying acids among household substances such as lemon juice and vinegar.
- NCERT Class 10 science: testing dilute hydrochloric acid and other solutions held in Test Tubes.
- Class 11–12 practicals: checking whether an evolved gas or solution is acidic, using moistened paper where needed.
- Checking whether glassware still carries acid after a final rinse from a Plastic Washing Bottle (Pisetta).
Standard Scope of Supply
Blue Litmus Paper is supplied as indicator test paper, as described above; pack form and quantity per pack appear 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
A quotation can cover one pack for a single classroom or bulk stock for a school group. Every quotation states packing, delivery time and price for that quantity, and red litmus, universal indicator or other school chemistry lab equipment in India can be listed alongside.
Science Lab Supplies is a registered exporter with an Importer-Exporter Code and can ship to buyers in Zambia, Rwanda, South Africa, Qatar, Sri Lanka and Vietnam. Send the quantity you need through the contact page, list the paper with other items in the enquiry cart, or turn to the lab tender page if the order forms part of a tender.
Frequently Asked Questions
What colour change does blue litmus paper show?
It turns red when it touches an acid. With a base or a neutral substance there is no change, and the paper stays blue, so a red strip is a clear sign of acidity.
Can blue litmus paper tell a base from a neutral solution?
No. Both leave it blue. Use red litmus paper as well: a base turns red litmus blue, while a neutral solution leaves both papers unchanged.
Who supplies Blue Litmus Paper?
Packs of blue litmus paper are quoted by Science Lab Supplies from Ambala, India, and can sit on the same order as red litmus, indicator solutions and the glassware used in acid-base tests.
How should litmus paper be stored?
Keep it dry, closed and away from acid and ammonia fumes, which can change its colour. Ask for the batch expiry date when you request a quotation.
Related Acid-Base Indicators
These items complete an indicator shelf beside blue litmus paper: its red counterpart and a red litmus solution for bases, universal indicator and a test paper assortment, phenolphthalein for titrations, a student acids kit and a wall chart. Any of them can be added to one quotation.
- Red Litmus Paper — turns blue when dipped in a base and shows no change with acids.
- Red Litmus Solution — indicator solution showing a red-to-blue change with alkaline samples.
- Universal Ph Indicator — paper test strips covering pH 0–14.
- Test Paper Books — books of test paper that include blue, neutral and red litmus.
- Phenolphthalein Solution Indicator — indicator reagent for titration endpoints and alkalinity observation.
- Acids and Bases Kit — reactions of metals with acids, safe hydrogen and carbon dioxide production, and indicator-dye tests.
- The Acid-Basic Environment of The Solution — laminated wall chart, 70 x 100 cm, for classrooms and laboratories.
Browse the full Chemistry Lab range, the Lab Chemicals range for indicator solutions, or all school lab equipment.
Last updated: 9 October 2026
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