Pauline Augustin combined several materials to obtain a larger support than was normally used for an ivory portrait miniature painted with watercolours. To obtain the 212 x 116 mm large support, thin ivory plates were assambled along opposite grain directions and glued to cardboard with shellac. The shrinking of the ivory caused severe cracking of the miniature. Later restoration measures, such as overpainting and scraping the paint layer, worsened its condition. The treatment of the support focused on the conservation of the original combination of materials, is described as well as the paint layer restoration. -- CAL