Being ultra pure, this agar is recommended for use in immuno-electrophoretic procedures, nutritional studies (vitamin Assay Media) or sensitivity testing procedure, where high purity and good diffusion of substances is essential.Agar Powder, Ultra pure is carefully manufactured and purified with utmost care as described by Nobel and Tonney. It is essentially free from impurities. It is light cream coloured, free flowing powder with particles of the size passing through 40 ASTM screen.It readily dissolves in hot or boiling water, but is insoluble in cold water. 1% w/v aqueous solution is clear and viscous.