The color depends upon the process used to coat the inside of the borosilicate glass capsule with phosphor.
Pots made of borosilicate glass (like Pyrex) have the distinct advantage of being oven and microwave safe.
The company encapsulates the trasers inside borosilicate glass capsules.
Since the curvature powers of the positive lenses are equal, the partial dispersions of the two glasses may be simply added together, and we then have: [0.543 +0.3741 The proportions given on the lower line may now be compared with the corresponding proportional dispersions for borosilicate flint glass 0.658, closely resembling the type 0.164 of Schott's list, viz.: [0.658 (A D = I.546) 50' 11 A slight increase in the relative power of the first lens of 0.543 would bring about a still closer correspondence in the rationality, but with the curves required to produce an object-glass of this type of 6 in.