Here is a five year test, no extra linseed oil was added to the tube color. This bleeding stain show the extent oil will impregnate good rag paper. This causes the paper to oxidize with the oil and it become brittle. The paper must be glued to a rigid support. A water based gesso should also be applied first in my opinion. To be sure, no white spaces should be left on any unprimed paper.. or it will turn from white to yellow.