Which type of Etchant do you recomend for use in your Etching machines ?

We recomend Ferric Chloride FeCl3 it has very good etching properties and is suitable for a wide range of applications and materials.  Ferric Chloride has a high etching speed and ensures perpendicular walls.  Ferric Chloride etches both warm and cold the optimum temperature being 45 degrees celcius.