The Effect of using Wax and Wood as a Watermark Material on the Pottery

Abstract Counterfeiting products in the marketing process often occurs, not only for imported goods, but also for local goods produced by small craftsmen. Watermark will be one way to show the authenticity of a product. Watermark will be one way to show the authenticity of a product. The method used to analyze watermarks is non-destructive testing. This non-destructive test utilizes digital radiography with x-ray exposure. The images obtained from the radiography are then analyzed using ImageJ. The method of analysis carried out is the method of visual analysis and physical analysis methods. The visual method in this study only identified the obtained watermark image. The identification of x-ray distribution in dry and burnt pottery was used as a method of physical analysis. The value of x-ray intensity on exposed pottery is then compared. The watermark material used is wax and wood. The Paraffin content in the candle will turn into gas if it is burned. The carbon content in wood can cause wood to gray to ash if burning is more than ± 6000C. In the process of making wet pottery, wax materials for craftsmen have difficulty printing, this can cause changes in the quality of the earthenware which is not good enough. On earthenware wood materials can be formed properly without changing quality. The watermark produced on wood burning material is not very clear. Material that can be formed in the printing process, does not change during drying, and does not change the quality of wood in the combustion process is wood material material.