Fat-washing is extraction and separation, not just adding richness.
Fat-washing uses a fat phase to capture lipid-compatible aroma, then removes enough of that fat for the final texture to work. It belongs beside hydrosol, tincture, infusion, and emulsion as a carrier-selection technique.
The failure is either greasy finish or weak transfer. If separation fails, the drink or sauce feels oily. If partitioning fails, the wash carries texture without enough aromatic signal.
The constraint is compatibility plus separation. Fat can carry browned, nutty, dairy, cocoa, spice, or pepper-fat signals that hydrosol underrepresents, but it does not guarantee transfer or clean removal.
Use fat-wash only when the target compounds and final matrix justify fat. Judge it by aroma transfer, clarity, mouthfeel, and oxidation control. Keep storage and transfer-efficiency claims marked.
Validate fat-wash through the finished carrier: does it smell right, feel clean, avoid surface fat, and avoid stale fat character? Exact contact and stability rules stay out.
