This sauna and bath infusion is intended to be mixed with water, not used neat on the skin. For a bath, add it to warm bath water and stir the water so the eucalyptus scent disperses through the bath rather than staying concentrated in one area. For a sauna, mix the infusion with water first and use the scented water as part of your steam ritual, following the usual safety rules of your sauna and stove.
Because eucalyptus has a sharp, fresh and cooling aromatic profile, it can become quite noticeable in heat and steam. Start lightly, especially in a small sauna room or if several people are using the space, then add more only if the scent feels comfortable. A good result should make the air feel fresher and more vivid without stinging the eyes, irritating the skin or making breathing feel unpleasant.
Avoid contact with eyes, and do not apply the undiluted infusion directly to sensitive skin. If it gets on your hands, rinse them before touching your face. People who react easily to essential oils or strong fragrances should test the aroma cautiously and keep the room well ventilated.