Dyes are used to colour or give shade to the pond water. They transform the dirty, unpleasing look to a beautiful and pleasing look of the pond. These are available in many colours these days like blue, black, red, yellow, green, etc. so that they are not only considered as a treatment but also as decorating thing.
What link is there between ancient Egyptian woven baskets and modern-day rattan garden furniture? This article gives the answer.