For the particles ambient_entity_effect and entity_effect, the color depends on the dx, dy, and dz parameters (see MC-123539), if particle count is 0.

However these parameters not only influence the color but also how the particles move.

For instance if the dimensions are is 255 0 255 (magenta), the particles will move outwards, but if the dimensions are 0 255 0 (lime green), the particles will move upwards.

Therefore, it is impossible to for instance have lime green particles moving outwards or magenta particles moving upwards.

Some example commands:

• /particle entity_effect ~ ~1 ~ 0 255 0 255 0
• /particle entity_effect ~ ~1 ~ 0 0 255 0 0
• /particle entity_effect ~ ~1 ~ 255 255 255 255 0
• /particle entity_effect ~ ~1 ~ 255 0 0 255 0
• /particle entity_effect ~ ~1 ~ 255 255 0 255 0
• /particle entity_effect ~ ~1 ~ 255 127 0 255 0

Video: Minecraft 1.18.2 - Singleplayer 2022-03-22 14-49-24.mp4