Cobalt glass filter, 50 x 50 mm very dark blue
    Cobalt glass filter, 50 x 50 mm very dark blue

Cobalt glass filter, 50 x 50 mm very dark blue

C7520-1A
Price on request
For observing flame colouring when testing for sodium or
potassium, cobalt glass plate with polished edges,
50x50x2 mm