[Compatibility between stone and alginate]

The compatibility between three alginates and three die stones was measured with a surface analyser and observed in the scanning electron microscope. For all nine combinations of alginate and die stone, the relief of the roughness standard was only partly reproduced. The compatibility of certain combinations was so poor that these should be avoided. Thus, Blueprint should not be poured with white Vel-Mix. Furthermore, it is recommendable to use combinations of alginate and die stone that result in the highest Ra-values possible.