CRT Rebuilding update

[nasadowsk]

Out of curiosity, why were they using a different material overseas? (Which also brings up the question - did other vendors over there use different compositions for everything?).

I know Beryllium phosphors were used in fluourescent bulbs in the US until just after WWII, and they were also used in some projection tubes in the US. Did they ever see use overseas in either application? And if so, when did the practice end?

[Notimetolooz]

I suppose in general there were many variation of things such as compositions.
Large companies like RCA, Sylvania, etc. could afford to research things. Patents on some things could cause some manufacturers to come up with variations. Company secrets in other words. Coca-Cola and Pepsi-Cola.
Other countries had other large companies and even universities did some research.
The cost and availability in different areas could also effect the formula what was used.