What is it in homebrews that causes blindness?

I've heard that different homebrews, specificly wiskeys can cause blindness. I'm wondering what causes it? Shady ingrediants? Unsanitary practices?

Alcohol content mainly. Some homebrewed hard alcohols can be 99% alcohol or 198 proof. By comparison, a bottle of Jack Daniels is 80 proof or 40% alcohol.

I'm not sure what causes this, but I know that any home made alcoholic beverage has that potential. However, for the most part from my understanding is that it's more along the lines of home brewed hard liquor.

If you do not distill the alcohol from your fermenter properly, you can end up producing methanol instead of ethanol.

Ethanol is the alcohol in beer, wine, whiskey, vodka...etc and can be consumed. Methanol is toxic and can make you blind if you drink it.

It has nothing to do with the ingredients or cleanliness. Its has to do with improper distillation.

This is one of the biggest lies usually used by governments to scare people and stop them making moonshine.The only way to cause blindness is to add and sell methyl alcohol instead of ethyl alcohol but this is something like a programmed crime.Nothing fermented from grape or cereals dos not give the amount of 20 grams of pure methanol which is needed to make you blind.Even in apple juice which we drink there is a percentage of methanol

it is not the ingredients
it is the incorrect containers people use to ferment in that produces ,what is known as wood alcohol .this can cause blindness


like iron tanks ,or drums of the wrong wood like pine

Methanol is the ingredient that causes blindness, along with kidney failure and liver damage. It's a form of alcohol (called wood alcohol) that the body cannot process. It's the same as in paint thinner, today.
I cant remember what causes it, though, sorry. But yes, it's associated with improper brewing/distilling practices.

Methanol, sometimes added to moonshine to increase alcohol content, can cause blindness, and in some cases, death.