Natural dyestuff extraction from onion (Allium cepa) skin and utilization for leather dyeing [soǧan (Alli̇um cepa) yumru diş kabuǧundan doǧal boyarmadde ekstraksi̇yonu ve deri̇ boyamada kullanimi]

In this research,the dyeability of leathers by using dye extract obtained from the extraction of onion skins (allium cepa) and obtained fastnesses have been investigated. aluminium sulfate [kai(so4)2.12h2o],copper sulfate [cuso4.5h2o] and ferrous sulfate [feso4.7h2o] mordants have been experimented to obtain various colors and enhance the fastness properties of dyed leathers. dyeing processes have been applied to chromium tanned leathers. color measurements have been performed by using konica minolta cm-3600d spectrophotometer and dyestuff exhaustions have been measured by using shimadzu uv-1601 pc uv-visible spectrophotometer. back and fro rubbing fastness test,perspiration fastness and light fastness tests have been performed according to ts en iso 11640,ts en iso 11641,and iso 105-b02 standards respectively. when the results have been considered,it was concluded that dyestuff exhaustion,colors and fastness values varied by mordant type used and generally all fastness tests gave acceptable results.