Changes of various wood coating colours due to natural ageing (exposure to weather) were measured with 2 different instruments: a colorimeter and an optical scanner. 9 different typs of coating, applied to Scots pine wood samples were exposed to the influence of natural weather. Measurements of colour were carried out before, between and after the exposure. The results obtained using 2 different methods (a colorimeter and an optical scanner) were compared and statistically analysed. The /L* values were found out not to be dependent on the measurment method. On the other hand, all other parameters indicating a change of colour (/a*, /b* and /E*) due to ageing were significantly influenced by the measurment method, especially at transparent wood coatings.