Sennelier is proud to release a line of non-toxic additives for oil paint. These are bio solvent based (meaning from sustainable raw materials such as vegetable oils and grain) and are biodegradable. 100% safe and easily disposable, they can be brought into a plane. Great packaging and remarkable capabilities.They cannot be used with solvent based mediums and it is important to be aware of the slightly longer drying time.Sennelier is proud to release a line of non-toxic additives for oil paint. These are bio solvent based (meaning from sustainable raw materials such as vegetable oils and grain) and are biodegradable. 100% safe and easily disposable, they can be brought into a plane. Great packaging and remarkable capabilities.They cannot be used with solvent based mediums and it is important to be aware of the slightly longer drying time.