Many household products contain lye, the chemicalsodium hydroxide. Lye is a caustic, alkaline chemical, which means it dissolves sticky substances like fat, and has a high degree of reactivity with other materials. Lye, in a flake, granular, or liquid form, is very dangerous and can cause damage to surfaces and people.
Lye is created out of a chemical reaction between soda, known as sodium carbonate, and calcium hydroxide, or lime. In raw form, it's made into solid flakes, chips, or grains. Chemical suppliers provide lye to manufacturers to make a wide variety of products, such as fabric, paper, personal soap, laundry detergent, pool-cleaning supplies, metal polishers, and drain de-cloggers. Since households utilize so many poisonous products, they must take care to keep cleaners out of the reach of children and only use them as directed. For instance, carefully follow the directions to clean a sterling silver gravy boat with lye-based polish, because even the fumes can be dangerous. Never use products like drain de-clogger or paint stripper without enough air circulation.
Caustic lye products pose other dangers to surfaces. They can dissolve substances to your advantage, like hair clogs in a shower drain, as well as to your detriment, such as the adjacent shower curtain. In fact, lye can damage and corrode paint, metal, cloth, plastic, and especially skin. Lye can be so reactive that, in its solid form, it should be kept away from metals, such as aluminum, and the open air. It's usually non-combustible when dry, but could ignite when mixed with water and cause a fire.
Before the modern manufacture of lye, people were able to make it out of raw materials. For thousands of years, people have used lye for soap making and tanning hides. They burned certain hardwoods at a very high temperature to make white, not gray, ashes. Apple trees, oak, and seaweedkelp make ideal fuels. Then water, mixed with a bit of baking soda, penetrates the ashes and removes the lye they contain. When the ashes are filtered out, the water holds enough lye to dissolve fat left on animal furs, or to mix with other ingredients to make strong body soap.
Have small dry well which is inaccessible, but it has backed up with leaves and other debris. Could i possibly add lye to dissolve the blockage?
- anon39479
27
is lye soap made w/pig lard ok to be absorbed into our bodies? what about the bad effects of pig fat, the antibiotics and hormones given to these pigs? Way back when, they fed pigs a proper diet w/out chemicals.
- anon36766
26
You can understand what lye is if you understand a few simple concepts about acids and bases. Lye is just the common word for NaOH, sodium hydroxide, the strongest base. This is the opposite chemical of HCl, hydrochloric acid, the strongest mineral acid. When mixed together they make simple salt water, but when concentrated as either acid or base, they are very dangerous to health. Both will attack and kill every living cell they come in contact with. However, HCl and NaOH have good uses around the house owing to this chemical energy.
HCl is useful for dissolving metals and some salts. They sell it at garden stores to use for cleaning concrete. You can also use it to remove rust from iron. (after which you should immediately wash then dry it)
NaOH is useful because it attacks oils and makes them soluble in water. The principal use for NaOH is to add it to fat in measured quantities to make soap. Soap is a wonderful chemical; intermediate between the highly reactive NaOH and the neutral H20, (water) it helps oils dissolve in water without being overly destructive to skin. After all, you don't want your skin chemically attacked when you clean it, you just want the dirt and oil to be made soluble so the water can wash them off. Try going a day without soap and see how much cleaning power water alone has.
The only reason to use NaOH directly is for very challenging cleaning jobs, where you want the total chemical energy available to dissolve fats. I'm using a little bit right now added to a deep frying tub. The caustic NaOH will attack those stubborn fats and turn them into soap, which I will be able to wash out later. However, the same chemical can turn my skin and subcutaneous fat to soap, which is where the danger is. Gloves are a must.
If you ever get any NaOH or HCl on your skin, you shouldn't waste time trying to neutralize with vinegar (for NaOH) or baking soda, (for HCl) but instead run the affected part of your body under continuous warm water for 5 minutes. Your best hope is to wash away all of the remaining chemical. If taken internally the same rule applies. Drink as much water as possible to dilute the chemical, then seek emergency medical attention.
- anon29174
25
What are the effects of Lye on the human body? I just recently read a Worn Path and the little boy in the story swallows it. His throat occasionally closes, are there any other effects?
- anon25800
24
How does one make the super cleaner "Mary Lou Lye" ??
- anon25120
23
Sodium Hydroxide (lye), is a common ingredient found in lots of things-like toothpaste! Just because in it's purest form it is dangerous doesn't mean it can't be used in weakened form to be helpful. In cosmetics, it's commonly used as a ph-balancing agent. Because it is so alkaline, a little bit in an acid-based solution balances out the ingredients and makes products more pleasant and stable.
It's a common misnomer among hairdressers that lye is in Johnson's Baby Shampoo which is just crap. I did some research into NaOH when they threw that old wives' tale at me. :) It's a safe and effective solvent, softener, and ph-balancing ingredient in the correct amount.
- anon24626
22
Cooking with Lye
I was hoping to find more information on the subject here, but I'm happy to share what I know so far!
1. Lye is poisonous
2. Lye does interesting things to texture food
In pretzels, rolls, noodles, etc. not a lot of lye is used. (A strong base, kansui, is used in making ramen. It gives the noodles its characteristic yellow color.) In Asian cooking, especially in desert making, lye water is called for and is used by the teaspoon in a lot of recipes. As for lutefish, lye seems to be used in the drying process, and to make the fish suitable for consumption, the fish must be bathed several times in clean water.
What would be more interesting to know is what pH range could be considered safe for consumption. Strong acids and bases have their hazards, but I imagine that during the cooking process the pH and chemical composition of the finished product changes drastically.
- anon24188
21
Does Vinegar neutralize a burn caused by lye?
- fgagrargg
20
im a scrapper and i came across hard drive that have platinum on them i was told i could use lye on then to eat away the aluminum will it work or not?
- jeffreyirvin
19
I came in contact with lye. i called an Ambulance. I have difficulty breathing w/ a respiration of 18.
after they gave 4 liters of Oxygen. I'm okay. did I have a panic attack? or cause by a lye chemical?
- anon18188
18
I have paint pants that have dried paint on them, Will lye clean them and if so how do I mix it and how long do I soak it?
- anon15548
17
In regard to the soapmaking... when lye is used to make soap it undergoes a chemical reaction. There is no longer lye, it is soap. This is why you should let your cold process soaps sit for up to 7 weeks though, so this chemical reaction can complete. Hope this helps you.
- anon15494
16
is it feasible to put lye down their holes to discourage moles?
- anon15066
15
Martha, I gotta ask... if you were sprinkling the lye because of the smell from the dead rodents, and you were able to actually sprinkle the lye over the whole area including the carcasses... would it not have been just about as effective to remove the carcasses?
- anon14079
14
My son dropped a plastic/metal hotwheel down my toilet and it is stuck, I tried snaking it. Will lye work to get it unstuck? Will it dissolve the car enough to push it through with the snake?
- anon11676
13
I am watching a TV show and a little kid fell in Lye. He got 1st degree burns. why is it that you can use it in household products and it doesn't burn but in this situation it did?
- anon9040
12
i have a report to do on lye, what do i need to know?
- anon7598
11
Many of the questions posted show very little knowledge of chemistry. When the lye which is poisonous reacts chemically with another substance a new substance with different properties are formed. For example -- poisonous, caustic lye (sodium hydroxide) and poisonous, caustic hydrochloric acid when mixed together form sodium chloride which is also commonly called table salt which is neither caustic nor poisonous -- in fact you SHOULD eat some daily.
- anon7267
10
I am new to soap making and if lye is so dangerous how come people are allowed to rub it all over their body in the form of soap?
- anon6944
8
Re: Lye under the log cabin: Thanks for the warning on the lye. I'll be sure to post a warning on the hatch door, just in case someone has to go under there. (You're right- there is plumbing in the crawl space) If all goes well, no one will be down there for a long, long, long time.
- martha
7
In regard to sprinkling lye under the old cabin, I am a plumber and have had several very very unpleasant experiences with lye under a building. professional flood restoration companies cannot use lye for that purpose because of the hazards associated with inhaling lye. Someday a plumber, electrician cable guy etc.. is going to have to deal with it being there. Please inform them before they do.
- anon5470
6
OK- I went ahead and sprinkled the lye on the dirt floor and rodent carcasses on the cabin crawl space. The odor is gone. For now. No humans go down there, so all seems good. Worked like a charm.
- martha
5
did they ever use lye for pickling?
- anon4773
4
just ordered 2 lbs. of lye to sprinkle in the crawl space of an old log cabin where mice and rodents have gone to die- hoping to get rid of the odor. No one ever goes down there. It's a dirt floor. Do I need to be concerned about anything? The lye would be exposed to air, dirt, and rodent carcasses. Since it is under the cabin, do I need to worry about fumes, or dust coming up into the air of the cabin? Should I mix it with water before I sprinkle it? What do you think?
- martha
3
there are several different grades of lye technical grade and food grade being two of them. Technical grade is over 99% pure lye and food grade is not as strong.
- anon2411
2
Lye is one of the ingredients in the production of noodles. If its dangerous then why is it allowed? Can somebody please explain me why?
- anon1568
1
So what about lye used with food, as with lutefisk, the practice of soaking whitefish in a mixture of water and lye?