Wet rendering simmers suet in a pot of water, then lifts off the fat once it's chilled into a cake. Dry rendering melts suet alone over low heat until the fat runs clear. Both make good tallow for skin. What matters is that the fat never browns and that no water stays in the finished jar.
We buy 100% suet, the dense fat from around the kidneys, from grass-fed and grass-finished cattle on Montana family ranches, bought direct. Our Montana render partner renders it before it's blended in small batches in the Mountain West. If you want to pour your own balm and skip the pot, the Craft Tallow Kit ($110, on pre-order with about a three-week ship window) is built for that. That's its price as of October 5, 2026. Its five tallow bases arrive rendered, with the botanical vials for all five recipes.
This one's the why. The steps live in our how-to on rendering beef tallow at home.
What does water in the pot change?
Heat, mostly. Water in an open pot can't get hotter than its boiling point, and while there's water under the suet, the fat can't scorch. That's an old trick. Anderson's 1962 extension folder on making lard, from the University of Minnesota, started its kettle with a little water to keep the fat from burning. It covers beef fat too.
A dry pot has no such ceiling, and that's where smell comes in. Push it hot and the cracklings brown. Jin and colleagues (2022) built a strong-aroma tallow on purpose, holding it near 150 C (about 300 F) with air bubbling through. Their paper puts it plainly: fat oxidized at normal temperatures tastes rancid, while heat makes flavor. A wet pot can't get near that heat while it still holds water, which is why wet fat tends to come out milder. Run a dry pot low and slow, and it can come out mild as well.
Does wet rendering give paler fat, or more of it?
Paler, yes. Vera and colleagues rendered Indonesian beef fat both ways for a 2025 Food Research study, at the same 90 to 100 C for an hour. The wet samples got twice their weight in water. Yields came out level, 81.33% wet against 80.68% dry, and the authors found no significant gap. Color wasn't level. Wet tallow came out lighter on the lab's color test. The paper adds that more heat or a longer render made the fat darker and browner.
One number went the other way. The wet tallow's acid value came out higher, 1.72 against 0.67 mg KOH per gram, though both sat under the 2.5 limit the paper takes from the Codex standard. Acid value tracks free fatty acids, and the paper doesn't pin the gap on a cause. I won't either.
Why can't any water stay in the finished fat?
This is the part that matters most once the fat's headed for a jar. A wet render's cake comes off the water with a damp underside, and finished tallow should hold no water at all. USDA's FoodData Central lists beef tallow at 0.00 grams of water per 100 grams.
Water left behind invites microbes. FDA's guide to water activity measures foods against distilled water, and it says most foods sit above 0.95, wet enough for bacteria and mold to grow. A bead of water left in fat sits near the top of that scale. Water also drives hydrolysis, the reaction that frees fatty acids from fat, so the National Renderers Association's buyer's guide recommends 1% moisture or less in rendered fat. Anderson's folder lists insufficient rendering to remove water among its causes of poor-keeping lard.
So a wet-rendered cake gets a dry finish. Melt it again and hold it over low heat until the bubbling stops, which Anderson's folder reads as the excess water driven off. A dry render run to that quiet point has already done the work. The method doesn't set shelf life by itself, though: in a 2024 study by Amaryllis and colleagues, dry-rendered and wet-rendered tallow oxidized at about the same pace in storage. Our balms skip water altogether and need no preservative system, which our post on why there's no water in our balms explains.
Which method should you use?
| Method | Heat | Smell | Color | Water left in the fat | Best for |
|---|---|---|---|---|---|
| Wet render | Capped near water's boil | Milder | Lighter | Some, until a dry finish | A skin jar, finished dry |
| Dry render | No ceiling, so keep it low | Roasted if pushed | Darker | None, once the bubbling stops | One pot, one afternoon |
For a skin jar, I'd wet render and finish dry. The water keeps the heat gentle, and the dry finish takes it back out before anything's jarred. That costs a night in the fridge and a second, shorter melt. If one pot and one afternoon suit you better, a dry render works too if you keep it low and stop once it goes quiet. Strain it fine either way and store the jars cold and dark. Before a new render goes on your face, try it on a small patch of intact skin for a few days. It's cosmetic care, not a treatment. Your provider's plan comes first. If you'd rather skip rendering altogether, all five of our balms start from our Montana suet.
If you'd rather not read five product pages, Find my balm asks two minutes of questions and hands you the jar.
Questions we hear
Is wet rendering or dry rendering better for skin?
Either makes good skin tallow if the fat never browns and no water stays in the jar. I'd wet render, then finish dry. The water keeps the fat from scorching, and in a 2025 study by Vera and colleagues, wet-rendered beef tallow came out lighter at about the same yield.
How do you render tallow without the beef smell?
Keep the heat low. Heat builds aroma: Jin and colleagues made a strong-aroma tallow on purpose in 2022 by holding it near 150 C (about 300 F) with air bubbling through. A wet render can't pass water's boiling point while there's water in the pot. Start with suet, not trim. Strain the finished fat through a fine cloth and store it cold.
Does wet-rendered tallow go bad faster?
Not by itself: in a 2024 storage study by Amaryllis and colleagues, dry-rendered and wet-rendered tallow oxidized at about the same pace. After 180 days at 25 C, their peroxide values were 17.3 and 16.9, both past the Codex limit of 10, while both read 4.8 at 4 C. Water that's left behind and warm storage are what hurt keeping quality, so finish a wet render dry and keep it cold.
Do you need salt to wet render tallow?
No. Some wet-render recipes add salt to the water for a milder fat. I couldn't find a study that measured what salt does to tallow's smell or color, so the research is thin and I'd call it optional. A 1962 University of Minnesota extension folder used fine salt to settle floating cracklings before straining.
Go deeper
Start with suet, not trim. If smell's your worry, will it smell like beef covers a finished jar, and how long tallow balm lasts covers the shelf. The beef tallow for skin guide picks up once the fat's on your skin.
Sources
- Vera N and colleagues (2025). Evaluation of physicochemical properties and fatty acid profile on Indonesian local beef tallow and lard using two different rendering methods. Food Research 9(1).
- Anderson PA, University of Minnesota Agricultural Extension Service (1962). Making lard at home. Extension Folder 120, the revised edition of February 1962.
- National Renderers Association (2003). Pocket information manual: a buyer's guide to rendered products. Web edition, 2008.
- United States Department of Agriculture, Agricultural Research Service (2019). Fat, beef tallow. FoodData Central database, SR Legacy release, FDC ID 171400, USDA.
- Jin Y and colleagues (2022). Optimization and preparation of tallow with a strong aroma by mild oxidation. Molecules 27(24):9047.
- US Food and Drug Administration (1984). Water activity (aw) in foods. Inspection Technical Guide 39, FDA.
- Amaryllis AR and colleagues (2024). Quality and oxidative stability of tallow extracted by dry- and wet-rendering. Indonesian Food Science and Technology Journal.
Brian is the founder of Craft Tallow, a small-batch tallow skincare line shipped from Cottonwood Heights, Utah, built on 100% grass-fed suet. Questions? Reply to any email from us; it lands with him.