This process can take several days, and during this time, the surface should be considered off-limits to food contact. When it comes to finishing wood, particularly items that might come into contact with food, safety is paramount.
Understanding Additives Inert and Food Safety with Boiled Linseed Oil
Once the linseed oil has dried completely through oxidation, the resulting polymerized film is essentially a solid plastic-like resin. Pure linseed oil (linum usitatissimum) is generally recognized as safe (GRAS) when used as a food nutrient supplement, but the additives in BLO complicate this status.
The uncured oil and the drying agents can be irritants. Many experts argue that a fully cured BLO finish is safe for applications such as cutting boards or salad bowls, provided it is not consumed directly.
Understanding Additives Inert In Boiled Linseed Oil
Immediately after application, the surface is wet and contains residual chemicals that have not yet reacted. The critical factor is allowing the oil to dry thoroughly in a well-ventilated area.
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