Formula · Animal fat
Tallow Heritage Bar
Forty-five percent rendered beef tallow with a little beeswax, which is roughly what a household soap would have been a hundred and fifty years ago — and still one of the best-working bars you can make.
RRecipe card
| Oil | Share | SAP |
|---|---|---|
| Beef Tallow | 45 % | 0.141 |
| Coconut Oil (76 °F) | 25 % | 0.183 |
| Olive Oil | 2 % | 0.134 |
| Castor Oil | 5 % | 0.129 |
| Shea Butter | 3 % | 0.128 |
| Beeswax | 2 % | 0.094 |
| Oil bill | 1 % | 140.5 |
| NaOH to weigh | 141.9 g | NaOH @ 99 % |
|---|---|---|
| Water to weigh | 330 g | 2.35 : 1 |
| Superfat | 5 % | Lye concentration 29.9 % |
| Yield | 9 × 163.5 g | Cure 6 weeks |
Reference bands follow the usual cold-process targets; the marker turns orange when a figure sits outside its band.
TTechnique notes
Why tallow keeps winning
Tallow is 26 % palmitic and 19 % stearic acid, so it hands you hardness and creamy lather in a single ingredient. It also has almost no polyunsaturated fat — 3 % linoleic acid against olive's 12 % — which is why a tallow bar resists rancidity for years where a sunflower-heavy bar goes off in one.
Hardness lands near 52, creamy near 45, bubbly near 27, conditioning near 47: every marker inside its band, which is unusual for a bar this hard. That balance is the reason tallow was the default soap fat for two centuries.
Beeswax: the ingredient people get wrong
Beeswax is a wax ester, not a triglyceride, and it takes up lye slowly. It is in the saponification charge — the calculator here includes its SAP value, 0.094, which is the lowest of anything in the library — so you do not subtract it. If you leave it out of the charge you will make a lye-heavy bar.
At 2 % it makes the bar firmer and slightly harder to lather. At 5 % it starts to suppress lather noticeably and the bar feels waxy on wet skin. Two percent is the useful ceiling for a bath bar; 5 % is for a gardener's bar that needs to survive mud.
Rendering, properly
Ask a butcher for suet — the hard fat around the kidneys — rather than trim. Chop it, render it at 120 °C until the water is gone and the cracklings float, then strain it hot through a fine sieve. Let it set and repeat at 100 °C with 200 ml of water per kilo.
The second pass is what removes the smell. Tallow that still smells of beef when cold will still smell of beef in the finished bar, because none of those compounds saponify. Good tallow is white, hard and almost odourless.
Add at trace
- 2 % beeswax — read the lye note before you add it, it does saponify and it is in the charge
- 3 % lavender and cedarwood blend at light trace
Equipment
- Digital scale to 0.1 g
- Stick blender
- A jug you will not use for food afterwards
- Fine sieve for the tallow
When it goes wrong
- The finished bar smells faintly of beef
- Under-rendered tallow. Rendering twice at temperature is not optional — the odour compounds stay in the fat and survive saponification. Render a third time with water, or blend the tallow with more coconut.
- Yellow specks in the bar
- Beeswax that never fully melted, or unstrained solids from the tallow. Melt the wax separately at 62 °C and strain the fat through a fine sieve while it is hot.
MMix
- Render the tallow twice. First pass at 120 °C to drive off water, second pass at 100 °C through a fine sieve. Cool it: good tallow is white and nearly odourless when solid. If it smells beefy cold, render it a third time with 200 ml of water per kilo.
- Weigh 450 g tallow, 250 g coconut, 200 g olive, 50 g castor and 30 g shea. Melt the 20 g beeswax separately — it needs 62 °C and will not dissolve in a 40 °C oil phase.
- Weigh 330 g water, then add 66.2 g NaOH. The beeswax is inside that charge: it saponifies slowly but it does saponify.
- Cool the lye to 40 °C. Keep the oils at 45 °C while the beeswax goes in, then let them fall to 40 °C before the lye.
- Pour the lye in and pulse in 3-second bursts. Tallow traces steadily rather than suddenly, so you have about four minutes of comfortable working time.
- Pour at medium trace. Tallow batter is heavier than an olive batch and needs a firmer tap on the bench to level out.
CCut
- Insulate for 18 hours. Tallow gels at a lower peak temperature than a coconut-heavy batch and does not need a long warm rest.
- Unmould at 24 hours. This is a firm loaf — it will come out of a wooden mould without a liner if you are careful.
- Cut at 48 hours with a flat blade. Nine bars at about 116 g. The beeswax makes the cut face slightly waxy to the touch, which fades by week three.
CCure
- Six weeks. Tallow bars cure fast and last a long time; the 2 % beeswax makes the bar noticeably harder at week two and slightly slower to lather for the first month.
- Weigh the bars: a proper tallow bar loses about 8 % of its weight over six weeks and then stabilises. If they keep losing weight after week eight, the humidity in your store is too high.
What matters here
- 45 % tallow: hardness ≈ 52, creamy ≈ 45, conditioning ≈ 47 — all in band.
- Beeswax is in the lye charge. Its SAP is 0.094 and the calculator already counts it.
- Render twice; the third pass with water is what removes the smell for good.
- 2 % beeswax firms the bar; 5 % starts killing the lather.
Questions that come up
- Can I use vegetable shortening instead?
- Yes, and you will get a softer bar with a different feel — shortening is mostly soybean and palm. Raise the coconut by 5 % and expect hardness closer to 45 than 52.
- Is tallow soap harsher on skin?
- Not inherently. This bar's cleansing score is about 18, identical to the mango butter bar, because the coconut load is the same. What people notice is the density of the lather, not the chemistry.
- How long can I store the rendered tallow?
- Six months in the fridge, a year in the freezer, and about two months in a cool cupboard. Add a pinch of rosemary oleoresin if you are keeping it at room temperature.
Next on the bench
Cold-process soap is made with sodium hydroxide: goggles, gloves and ventilation, and keep the batch away from children and animals. This recipe is information, not medical advice — a hard, long-lasting bar is not a medicated one.