Black Sope

This was part of the plan for Kingdom A&S in March. I had acquired the wood ashes (surprisingly challenging when one lives in the heart of suburbia without a fireplace), I’d even managed to drip my lye by the time KA&S rolled around in March.


Homemade lye

Let me back up a step to talk about lye. That’s the hazardous part of soap making that scares a great many people off. (Yes, it will burn you. Treat it with the respect it deserves. Gloves are smart, don’t breathe the fumes, but equally don’t freak out and run screaming. You got this.) Lye is the basic (alkaline) part that makes saponification go. Saponification, in a super quick nutshell, is the chemical reaction that happens when fats and bases get together and produce soap (and some other stuff). There will be a much bigger post about saponification after I finish writing that class about it that I’m teaching at Trillium Wars. <counts days, has a quiet erk. Right!>

Modernly, you go to the hardware store, look in the plumbing section and bring yourself home a bottle of lye crystals. (Or you go to Amazon, cause Amazon.). That’s Sodium Hydroxide, and it’s pretty stable in crystal form. (Wear gloves. Don’t sniff deeply, don’t lick it.) It makes the lovely firm bars of soap that we all know and love. It’s also challenging to get in a medieval context. Not impossible, just challenging. Period lye was Potassium hydroxide generally, and much, much easier to get your hands on. Hardwood ashes + water = potassium hydroxide. Potassium hydroxide makes a soft soap, not quite liquid soap, but goopy that never really sets up hard. There wasn’t much in the way of pH meters hanging about, so the strength of your lye was determined by how well it floated an egg. (Interestingly, the strength of brine.. also determined by egg floating. Eggs are darn useful things, and tasty too! Do not eat the egg you floated in lye. Just saying.)

Right! So I dripped my (distilled) water through the hardwood ash and came out with lye. I even diluted it to the required strength for a mild soap. (My soap making directions all came from Mistress Elska who knows more about period soap than anyone else I know. Go read all of her awesome. She’s super cool.) As much lye above the egg as below it. Perfect.


pH testing magic

And then life happened. And we all know how that goes, and suddenly it was June and I wanted period soap to try washing some fleece with. Ha! Incentive to get this cooked up. A quick pH test showed my diluted lye was at least pH 9 (the indicator I used only goes to 9 and my pH meter was hideously uncalibrated and I was out of calibration solutions. The woe of the modern alchemist who wasn’t planning ahead.), so not wholly dead yet, but I had some concerns. Liquid lye isn’t the most stable of things, it’ll degrade pretty good. The recipe called for 3 parts by weight lye to 1 part by weight fat. So my 927g of lye was going to get 309g of fat. I had some lard I rendered that needed using up, and then the other half of my fat was beef tallow.


Pork lard and beef tallow

Melt the fat, pour in the lye, give it a darn good whirl with the stick blender (yes, I could have done it by hand, but it was late) and let it wait overnight. Another good stir the next day and then the cooking started. I work in a crockpot, and remember that life thing that got in the way of using the lye in the first place? Right. It kept popping up for the cooking of the soap. It was getting cooked for a couple hours at a kick, and then I’d have to leave, so I’d turn it off again, and come back to it much later and start again. So it went, and then it was the night before I wanted it and it was STILL liquid and not soap. I was headed to bed, it looked like it was JUST barely starting to come together, and I asked my video game playing spouse to keep an eye on it, stir it now and then and turn it off when it looked like thick pudding, or vaseline.

I got up the next morning to a dark brown pot of charred goo. (Yes, he forgot and yes he apologized. Such is life, it isn’t the end of the world.)  I came >< close to just chucking it, but decided at the last moment to toss it in a plastic pot and bring it along to the event. At the very least, we could have a good laugh about my charcoal riddled goop. When I was washing out the crockpot, I noticed that it.. acted like soap. It melted like soap, it felt like soap between my fingers. Not classic soap, soap with the texture of playdoh and random crunchy bits, but certainly soap. Well, hunh.


Mind the crunchy bits.

Arrive to a group of awesome people and a swack of dirty fleece and we all have a snicker of the charred goop, and decide to try it. I mean, we’ve plenty of fleece to play with, a bit of ‘well that didn’t work’ isn’t going to be the worst. While I’d been off at other obligations, they’d already tried a laundry bar soap, some laundry detergent and just water to varying degrees of clean. So into the warmish water a clump of my goop goes, with a lot of swishing about to get it to dissolve. But it DOES dissolve! (Mostly. It really does need encouragement, and well.. one needs to pick out the charcoal bits, those don’t dissolve. <ahem>)

In goes some wool, and it gets a good swish about and hotting up and after a little while, a trip through the salad spinner. (Best. Thing. Ever for pre-drying your wool. Seriously. I needs me one.) And it’s white! It’s clean! Pretty and clean! Our tepid water was doing nothing to the lanolin, but the soap of epic fail did a darn fair job at washing the dirt out, I was most impressed.

<I forgot to take pictures of the wool. Picture pretty wool, all white and clean before carding or combing>

I will try and make it again with freshly dripped lye, and a lack of forgetting it to burn, and see what we get, but wowee, even with everything against it.. we got soap! Alchemy ftw!

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s