These mesh fabrics are machine washable and can be used over and over.
We recommend the following for each color:
White or Blue mesh is used for larger reptile skin such as Alligator
Blue is a more rigid mesh, which will keep the shape you give it.
White is more flexible and light weight, making it easier to wrap around corners.
Purple is a light weight fabric with medium sized diamond shape and is most suitable for fish scales
Black is a very light weight fabric and has the smallest diamond shape of any of the other fabrics, it is most suited for snake skins
Description and photographs from woodicing.com