Quote Originally Posted by robert42
DONT USE IT ON COLOURED PIPES OR U WILL LOOSE THE COLOUR.
I don't believe that is true. The pigments used to color the glass are inside the glass. Glass is nonporous, so there's no way (with the exception of tiny surface cracks and imperfections) for any chemicals to get in and affect the coloration. Even the surface glazes used in ceramics are virtually impervious to attack by chemicals. Glass containers are well-suited to the task of storing nearly any chemical, with the execption of a few strong acids, exactly because of this quality.