How to export a converted image and keep it as a RAW file

raw images cannot be edited. When you export a raw image from Lightroom, what you get is a raw file with a xmp sidecar file. Adobe software such as Lightroom and Photoshop camera raw will read both files and apply the same treatment to the image as Lightroom does. However, only Adobe software can understand these editing instructions. If you send these two files together to another person, they will see the image in black and white when they load it into Lightroom or Photoshop with all your edits intact, but the image will look color in Finder or Explorer or any other non-adobe raw software. You can also export as a dng file. What will happen in that case is that the raw data and the xmp sidecar will be integrated into the same file but also Lightroom will put in a jpeg preview of the image with all the edits applied. However, again only Adobe software can understand this.