When I open a folder in Bridge all my photos become washed out. It is like watching marching ants going one by one as each photo becomes washed out. The only ones not touched are the ones I have processed in Camera Raw.
Bridge is applying your default ACR camera setting to any and all raw files that do not have a setting applied to them (with its XMP sidecar file).
Open an image in ACR and adjust it to your liking. Before you close the ACR dialogue box, click the far-right down-arrow in the settings tabs and select "Save as new camera default". Then close the file and apply the settings to the raw image. Back in Bridge, the program will reset the previews according to that new camera default setting.
Obviously, each image will need its own specific ACR setting, but this is a way to get the previews "in the ballpark".
To make sure each raw image has its own ACR settings file, simply copy the develop settings from one preview and paste it to any image(s) you want. Then Bridge will use that XMP setting to generate the preview of the image.