Abstract
A weathering study has been conducted on Visund Sør condensate and Visund crude oil. The weathering study is based on a small-scale laboratory testing at 13 °C. The SINTEF Oil Weathering Model (OWM was used to predict the weathering of Visund Sør and Visund if spilled on the sea surface. The weathering properties of the Visund Sør and Visund were discussed in relation to oil spill response.