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. Teachers use it for the first acid-base tests in middle school and for quick checks during college chemistry practicals. From its base in Ambala, India, Science Lab Supplies provides the paper to schools, colleges, training centres, tender contractors and distributors.
Specifications
Blue litmus paper gives a single, easy-to-read result. A drop of an acidic solution changes the blue paper to red; a basic or neutral solution produces no change, so the paper stays blue. It is usually used together with red litmus paper to separate bases from neutral liquids.
| Parameter | Value |
|---|---|
| SKU | SCL-CL-11606 |
| Type | Indicator test paper |
| With acids | Turns red |
| With bases | Stays blue (no change) |
| With neutral substances | Stays blue (no change) |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for Blue Litmus Paper
The paper is used whenever a class must decide quickly whether a sample is 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 needed.
- 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 with indicators.
- Class 11–12 practicals: checking whether an evolved gas or solution is acidic, using moistened paper where needed.
- Checking whether glassware rinse water still carries acid after cleaning.
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. To enquire, use the contact page, build a list in the enquiry cart, or follow the lab tender page for tenders.
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.
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?
Science Lab Supplies supplies it from Ambala, India, and can quote it together with red litmus, indicator solutions and glassware for the same laboratory order.
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 for bases, universal indicator for approximate pH values, test paper books for handing out to students, and a wall chart on acidic and basic solutions. All four can be added to one quotation.
- Red Litmus Paper — the partner paper for detecting bases.
- Universal Ph Indicator — pH 0–14 indicator paper.
- Test Paper Books — test paper in book form for class use.
- The Acid-Basic Environment of The Solution — a chart on acidic and basic solutions.
Browse the full Chemistry Lab range or all school lab equipment.
Last updated: 25 September 2026
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