(light symphony music with
chalk writing on board) - Welcome to Brain Stuff. Not to get too personal, but when did you last wash your jeans? Whether you're wearing
a pair of busted Levi's or brand new raw denim from some fancy boutique with a weird name, your pants are part of a debate that
designers and customers alike have been having for
decades, and it's this: when should you wash your jeans? Do you need to wash them at all? Let's look at the basics. Denim is a kind of cotton
with a twill textile weave. In a twill weave, the
thread called the weft, the cross-wise yarn, passes
under at least two warp threads. Those are the length-wise yarns. In most jeans, only these
warp threads are dyed, meaning that the other threads, the weft threads, remain white. That's why blue jeans
are white on the inside. And that blue shade on the warp threads comes from a dye called indigo. Unlike some other dyes, indigo doesn't penetrate the cotton, you know? Instead, it sits atop the yarn on the surface of each
thread, and over time, molecules of the indigo chip away, causing the fabric to fade, and this fade is what makes each pair unique, so much so that the FBI analyzes denim patterns when tracking criminals. I mean, put your tin foil hat on. They're watching your jeans. The more you wear a pair, the
more broken in they become, and you'll see the
appearance of fade patterns. You know, whiskers on the front, honeycomb patterns behind
the knees, and so on, and here's where it gets,
wait, what show is this? Not all jeans are created
equally, so let's divide them into two rough categories: washed and raw. Washed denim is just that,
washed after dying to make the fabric softer
and reduce shrinkage. Sometimes washed denim is
artificially distressed to give it a pre-broken in or worn look. The fading of raw denim,
on the other hand, happens naturally over time depending on the activities of the
person wearing the jeans. So the longer you go
without washing these jeans, the more pronounced that fading pattern becomes, personalizing the pants. Once you have a pair jeans, you will hear numerous pieces of advice
about caring for them. So much stuff. Most of this does not
apply across the board. For example, some companies
will ask you to wait at least six months
before washing your jeans because if you wash them early, the indigo will wear off uniformly, robbing you of those unique fade patterns. And this is the heart of that whole to wash or not to wash question. The longer you go without
washing a pair of jeans, the more pronounced that
wearing pattern becomes, and you also preserve
the indigo, as well as the stiff texture of the fiber, which I hate, but a
lot of people are into. So what happens if you don't wash them? Great question. Won't bacteria pile up, turning
your entire lower hemisphere into a plague-ridden cesspool of filth? Not necessarily. In 2011, a microbiology student at the University of
Alberta went, get this, 15 months without washing his jeans. I don't know, may, I don't
know if he's single or what. He tested their bacterial
content, along with the bacterial content of another pair that had been washed about
two weeks beforehand, and he found almost no difference. Anyway, if you can't
wash them, what do you do to keep your blue jeans clean? You'll hear some, some crazy stuff. Levi's famously recommended
freezing your jeans to kill bacteria and stave off any funky odors, but that is bunk. Take them out now if, if
they're in your fridge. Your roommates think you're being weird. See, microbe expert Stephen
Craig Cary says that's a myth. Most of the bacteria in our
pants comes from our skin, and a lot of these organisms are pre-adapted to low temperatures. Instead, Cary recommends
using high temperatures. Think like 121 degrees
Celsius for 10 minutes. He says that will rid
the denim of bacteria. Or, he adds, you could just wash them. So depending on how often
you wear your jeans, their age, the type of
denim, and what you do while you're wearing them,
you really don't have to wash them as often as, say, your underwear, which
you should be washing. If you want to get that uber-cool, unique fading pattern,
your best bet really is to avoid washing them for a while. And regardless of how
carefully you care for your favorite pair of raw denim jeans, messes, like life, find a way. One day, some sort of
disaster will strike, and you'll have to clean
your jeans somehow. Yes, even if that means washing them. Well, that's it for now. Thank you for watching. I know we didn't get
into some of the again very specific care instructions that many boutique jean manufacturers insist upon, so your best bet is to check the brand-specific instructions
for your pants. And one last question: what are
your favorite type of jeans? Are you one of those people who, like me, didn't wear them for years? Lemme know in the
comments, and, as always, stay tuned for more Brain Stuff.
