Here's a good one:
http://scp-wiki.wikidot.com/scp-447A limitless supply of green slime that makes excellent lubricant, increases fuel efficiency in gasoline engines, and makes good salad dressing?
Sounds useful!
Too bad there's that terrible thing that happens when it comes into contact with dead bodies.
Date: ██/██/████
Test Subject: 2 cups of water
Procedure: One (1) tablespoon of SCP-447-2 thoroughly stirred into water.
Results: Water turned a green tint but is otherwise normal. Contaminants reduced by 78%
Notes: "This would make a good chlorine subtitute for swimming pools; all the cleanliness of chlorinated water without the bleachy smell or hair discolorization. Too bad some swimmers are careless and turn into dead bodies."—Dr. Ray A██████
