Cobalt Blue Glass (Flame Testing)
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Product Code : LSK-CL-10050
Cobalt Blue Glass (Flame Testing) (SKU LSK-CL-10050) is an optical filter held between the eye and a flame during flame tests. It absorbs the strong yellow light produced by sodium contamination and makes the violet and blue hues of potassium ions much easier to see. Chemistry teachers and students use it in salt analysis at senior secondary level and in college inorganic practicals. Science Lab Supplies dispatches this filter from Ambala, India to schools, colleges, training institutes, tender contractors and distributors.
Specifications
The filter is a piece of cobalt blue glass. Almost every salt sample carries traces of sodium, whose bright yellow flame can hide other colours; viewed through the blue glass, that yellow is largely cut out, so the lilac-violet potassium flame stands out clearly.
| Parameter | Value |
|---|---|
| SKU | LSK-CL-10050 |
| Material | Cobalt blue glass |
| Function | Optical filter that removes yellow sodium light from a flame |
| Helps to see | Violet and blue hues, e.g. potassium ions |
| Use | Flame testing in qualitative analysis |
| Supplied by | Science Lab Supplies, Ambala, India |
Applications and Experiments for the Cobalt Blue Glass
Cobalt blue glass is used whenever a flame test must confirm potassium in a sample that also contains sodium. The student holds the glass in front of the eyes, introduces the sample on a wire loop or splint into a non-luminous flame, and records the colour seen through the filter.
- Class 11–12 chemistry: flame tests for cations in salt analysis.
- B.Sc. inorganic chemistry: confirmatory tests for potassium in mixtures.
- Pharmacy and applied-science labs: identifying alkali-metal ions in qualitative tests.
- Classroom demonstrations of how a coloured filter absorbs certain wavelengths.
Flame tests use an open flame and often concentrated hydrochloric acid for cleaning wire loops; wear eye protection and carry them out under supervision.
Standard Scope of Supply
The Cobalt Blue Glass (Flame Testing) is supplied as a single glass filter, as described above. Burners, wire loops, splints and test salts are separate items; any optional accessories are listed on the quotation.
Packing, MOQ and Lead Time
Order one filter for the demonstration bench or one for every student pair. The quotation will show packing, delivery time and price for the quantity you name, and glass items are packed so they travel safely with burners and other chemistry lab equipment in India.
Holding an Importer-Exporter Code allows Science Lab Supplies to ship to buyers in Malaysia, Peru, Egypt, Iraq, Nigeria and Kenya. Enquiries reach the team through the contact page or the enquiry cart, and institutions buying by tender can refer to the lab tender page.
Frequently Asked Questions
Why is cobalt blue glass used in flame tests?
Sodium traces give a strong yellow flame that masks other colours. The blue glass absorbs that yellow light, so the violet colour of potassium can be seen and recorded.
How do I use the filter?
Hold it close to your eyes and look at the flame through it while the sample is being heated. Compare the colour with and without the filter.
Who supplies the Cobalt Blue Glass (Flame Testing)?
Science Lab Supplies supplies it from Ambala, India, and can add burners, blowpipes and other analysis apparatus to the same quotation.
Can it be ordered for a whole class?
Yes. Give the number of filters and your delivery location through the contact page to receive a quotation for the full quantity.
Related Flame Test Apparatus
These four items round out a flame-test and dry-test station alongside the cobalt glass, providing the flame, the sample carriers and the blowpipe tools used in salt analysis.
- Adjustable Bunsen Gas Burner with Control Valve (Set of 2) — non-luminous flame for tests.
- Wood Splints — for gas tests and simple flame tests.
- Blowpipe Nickel Plated Brass — focused flame for dry tests.
- Blowpipe Carbon Blocks — sample support for charcoal-cavity tests.
Browse the full Chemistry Lab range or all school lab equipment.
Last updated: 25 September 2026
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