Blue-green. It was used mostly only in oscilloscopes [1] because the persistence time was really long - good for instruments where the signal might be changing

Blue-green. It was used mostly only in oscilloscopes [1] because the persistence time was really long - good for instruments where the signal might be changing faster than a human can perceive not so much for low latency inputs. [1] https://www.wellenkino.de/565/565-1.jpg https://www.wellenkino.de/565/565-1.jpg