The strength of the oxide skin on molten aluminum is believed to be important in a lot of metal processing steps. Among others, it affects the surface finish of DC-cast ingots through the dynamics of the meniscus, and the yield of metal recovery when dross is processed. This paper presents recent measurements of oxide skin strength on molten aluminum. The measurements were done on Al + 1%Mn and Al + 5%Mn, and are compared to earlier measurements on pure aluminum. Also the effect of commercial salt on the oxide skin strength on AlMn alloys is presented.