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I suppose that the following definition can be extended to define the "series" differences, not just student vs professional grade?
Both artist grade and traditional student grade are made by packing fluid oil with pigment to get the desired stiffness of paste. The difference between them is that traditional student grade has pigment taken out and replaced with extenders. This lowers the price, tinting strength, and opacity. But the two types share the quality of raw materials.
So what level do you choose/feel is adequate?
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