Many archaeological wooden artefacts covered with a layer of black resin were found in a bad condition, and it was urgent to choose the best consolidation material. Black resin had a special case on conservation because it contains natural resin in composition, and it turns into small fragments and separated from the artefacts. Color meters were used to assess the rate of chromatic change by studying the change reflectance of the sample. The present study focuses on evaluating the efficiency of many consolidation materials used for consolidating the black resin samples, e.g. Nano Paraloid B-72, Paraloid B72, Klucel G (Klucel G, hydrox-yl propyl cellulose) and Klucel E (Klucel G, hydroxyl propyl cellulose). The optical properties of black resin were studied using Opti-Match and gloss meter. Nano Paraloid B-72 in xylene gave the best result for con-solidating the black resin layer.