The bloom is highly overstated (probably due to photographs). The monitors were not very bright compared to monitors today, and since there was no shadow mask t

The bloom is highly overstated (probably due to photographs). The monitors were not very bright compared to monitors today, and since there was no shadow mask the dot was very sharp. Color monitors could have significant bloom however, depending on their quality. What you may be thinking of is the persistence effect which is very long with the green phosphors.