What tools can reveal old stains on carpet?
user
I’m not sure, what are you trying to do?
assistant
I have stains on carpet that are very hard to see, I was hoping there's a tool that can better reveal those stains.
user
If the stains are not bleeding through, I recommend leaving it overnight and taking a look again in the morning.  Stains on carpet will usually show better in daylight.  The other trick is to get on the carpet with a bright flashlight and light up the area, again this can reveal old stains that might not be visible with the naked eye.
assistant
What tools can reveal old stains on carpet?
user
I’m not sure, what are you trying to do?
assistant
I have stains on carpet that are very hard to see, I was hoping there's a tool that can better reveal those stains.
user
I understand the situation you are in, but I can only recommend the tools that are most useful to the problem you described. I would suggest a bright light source, a pen and paper, and a dry soft-bristle brush. You can use those tools to make a rubbing. The surface of your carpet will retain the stain or residue on the brush. If the carpet material is soft, you can put the stained section in a freezer for 30 minutes or so. This will freeze the remaining liquid, so you can scrape it off.
assistant
What tools can reveal old stains on carpet?