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Your cart is empty.High-quality dark blue cobalt glass filter is used in sodium and potassium salt flame tests. When a flame is viewed through this filter, the color orange is blocked so that a violet-colored flame is visible.
Jesse
July 21, 2025
The clearest and darkest and thickest cobalt glass I've seen before. I love this glass. I use this glass to take pictures with for lab experiments and it really does work and it really is good stuff. It is crystal clear (as in the glass quality is good and clear and thick), and the cobalt darkness is good and dark too. I'd recommend this to a friend and any laboratory.
Raymond Brown
June 21, 2025
These cobalt filters are excellent at blocking the yellow light from sodium in flame tests. Not all filters of this type work as well.
Guolin Li
June 2, 2025
Works great. It is quite expensive.
;°)
May 14, 2025
These plates are a good bit darker than one might think from the images.
3turtles
December 1, 2024
Worked great for student flame tests! will buy more
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