Note 128 — Appendix. Cement for Earthenware. Restorations.

Krefting’s method affords an excellent illustration of the truth of my remarks in the preface that the literature upon these preservation-methods is very scattered and in consequence has been hitherto but little studied. In 1892, when visiting the Museum at Christiania, I had the opportunity of examining some iron objects which had been treated by Krefting’s method. I then obtained his address, and Herr Krefting kindly communicated his method to me by letter, and in the following year forwarded a reprint of his article referred to above. In 1887 he had described his method to Appelgren by letter, but at that time he treated the object after reduction, washing, and drying, by impregnating it with a paraffin-petroleum solution. In 1897 Appelgren published this method, with drying and impregnation, in ignorance of Krefting’s publication in 1893.