[Changes of various proteins in older blood stains]

26 unequally old groups of blood stains up to 180 days old were examined for the presence of albumin, Ig A, Ig G immunoglobulins, beta 1 C globulin and transferrin. To ensure different external conditions, each group was composed so as to contain blood stains of the same age but preserved under different conditions and on different types of underlying material. Albumin and Ig G immunoglobulin proved to be among the most stable ones. However, due to variations in the results the practical uses of this type of blood stain age estimation appear to be problematic.