Mudsponge Orange Absorbent SpongesMudsponge Orange Absorbent Sponges The Orange Absorbent pop up sponge is the perfect throwing sponge. More absorbent than the White Finishing and the Blue Workhorse, it is the sponge Michael uses for throwing. Natural sponges have been used by potters for years. However, the quality of natural sponges can be unpredictable and we try to be environmental conscious about what materials we use and the long term effects. Our sponges are made of a