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 filters out the yellow light caused by sodium contamination and widens the ability to see the violet and blue hues of potassium ions. Chemistry teachers and students use it in salt analysis at senior secondary level and in college inorganic practicals. From Ambala, India, Science Lab Supplies supplies the filter on request to schools, colleges, training institutes, tender contractors and distributors.
Specifications
The table records each property of this flame-test filter separately. In a sentence, it is cobalt blue glass used as an optical filter that removes the yellow sodium flame so violet and blue potassium hues show, and its effect is doubled when viewing is done under fluorescent light.
| Specification | Value |
|---|---|
| SKU | LSK-CL-10050 |
| Material | Cobalt blue glass |
| Function | Optical filter |
| Filters out | Yellow flame caused by sodium contamination |
| Makes visible | Violet and blue hues (potassium ions) |
| Under fluorescent light | Twice the filtering effect |
| Application | 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, practised on known salts such as Potassium Chloride.
- B.Sc. inorganic chemistry: confirmatory tests for potassium in mixtures, for example with Potassium Nitrate as a reference sample.
- 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. Burners, wire loops, splints and test salts are not included; they can be quoted as separate items on the same document, so that each flame-test station is priced as one complete list.
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 can be packed to 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. For a class set of filters, send the number of student pairs through the contact page, or build a flame-test list with burners and salts in the enquiry cart; tender-based purchases are explained on the lab tender page.
Frequently Asked Questions
Why is cobalt blue glass used in flame tests?
Sodium contamination gives a strong yellow flame that masks other colours. The blue glass filters out that yellow, so the violet colour of potassium can be seen and recorded even when sodium is present.
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; under fluorescent room light the glass has twice the effect.
Who supplies the Cobalt Blue Glass (Flame Testing)?
The filter is supplied by Science Lab Supplies from Ambala, India, and the same quotation can include burners, blowpipes, carbon blocks and test salts for a complete qualitative analysis bench.
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 covering packing, delivery time and price for the full quantity.
Related Flame Test Apparatus
These items round out a flame-test and dry-test station alongside the cobalt glass, providing the flame, the splints, the blowpipe tools and a known salt used in qualitative analysis, and all of them can share the quotation.
- Adjustable Bunsen Gas Burner with Control Valve (Set of 2) — two gas burners with direct fuel-flow control.
- Beck Bunsen — burner lit with a striker, with gas knob and air collar.
- Laboratory Spirit Burner — metal burner with a small cap for snuffing out the flame.
- Wood Splints — for lighting burners or testing for oxygen.
- Blowpipe Nickel Plated Brass — plated brass pipe that helps with the analysis of small samples.
- Blowpipe Carbon Blocks — compressed rectangular blocks for blowpipe work.
- Strontium Chloride — strontium salt reagent for solution preparation and qualitative analysis.
Browse the full Chemistry Lab range, the Lab Chemicals range for flame-test salts, or all school lab equipment.
Last updated: 9 October 2026
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