User talk:Bangtanblack

September 2020
Hello, I'm Materialscientist. I wanted to let you know that I reverted one of your recent contributions —specifically this edit to ACT (test)—because it did not appear constructive. If you would like to experiment, please use the sandbox. If you have any questions, you can ask for assistance at the Help desk. Thanks. Materialscientist (talk) 14:11, 7 September 2020 (UTC)

When I want to change anything, in any time it is ok for you? Bangtanblack (talk) 14:14, 7 September 2020 (UTC)