This report describes the materials and techniques employed on the painted wings of Friedrich Herlin's high altar at Bopfingen. The panels are made of lime wood, and lined on the inner sides with canvas. The inert material of the ground is calcium and magnesium carbonate, and a small amount of white lead. The underdrawing reveals some alterations carried out in the final paint layer. The paint medium appears to consist essentially of a drying oil. The pigments correspond to the usual palette of fifteenth century easel painting; the use of a grey rock powder (slate) is, however, unusual. The painting technique may be defined as <i>Schichtenmalerei, embellished by tooled and burnished gilding in the backgrounds, and mordant gilding in some haloes.