Oil-modified

ambering
...Oil-modified urethanes (OMU) have a tendency to darken or "amber" over time. This phenomenon usually occurs within the first six to twelve months after the finish is applied...
omu
...Stands for oil-modified urethane. A popular type of wood floor finish. Contains aromatic urethane in a solvent (oil) base. The solvent is usually mineral spirits or a similar petroleum distillate...

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