Volumetric fog changing colors

hi , so I made some volumetric fog and set the default color to white. Which when I put it on the level it is white. when I hit play in the editor it is almost black , or at least much darker. It is also black/darker in a packaged game. Is there a reason for this? thanks

I found that if I throw a directional light above it , then it is white for the most part.