• Last Post 05 September 2017
darylzufall posted this 04 September 2017

 why does my white plaster turn black after shocking ? it will not brush away.

Service posted this 05 September 2017

Hi darlyzufall,

The black stains sound like they could be black algae or copper stains. The best bet is to get a Jacks Magic Stain ID Kit this kit will identify the stain type as each type of stain has a different prescription for treatment. Once you determine the stain type from the kit please let us know and we will let you know how to treat the stain.

Thank You