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A while ago, we used some kinetic sand and some molten gallium to cast
a small version of Grants face.
Today, we wanted to scale that up and we're going to be trying
to make a life-size cast of my face in metal.
This kinetic sand stuff is really cool and it compresses down holding
a surprising amount of detail, which is why before, we
took this little 3D print of Grants face,
used it to make a mold and then cast some gallium into that sand.
That worked out really well.
And today, we want to try scaling that up.
We've got quite a bit more kinetic sand,
and we're going to see
if we can do a full size casting of my face.
What we're going for here is pretty simple.
We're going to take a bunch of kinetic sand,
put it into a box,
and then try smushing my face into the sand to make a mold,
filling it with molten gallium, which should cool off
into a solid metal face.
So we've got kinetic sand here, here, here, and here.
And then we've got a bunch of gallium and this stuff is super cool,
by which I mean, it's molten while it's quite cool.
I can easily put my hand in it without any worry of burning
because it's just not that hot.
Our thermometer's actually currently registering the surface
as below the freezing point of gallium,
which means it should be solidifying and it is a little bit we've got sort
of a skin on here.
This gallium is currently just barely warm enough to stay liquid.
It's cooling down fairly quickly and we start getting solid parts
and this can easily remelt including just...
By putting it down at the bottom of this
but it is cooling off quite a bit.
When it's hot, it stays bright and silvery a lot quicker,
but this is cool,
so as I clear a space away it just starts freezing,
and you can see it stopped being quite so silvery very quickly.
So, the goal is going to be to take our kinetic sand, put that into a box,
and try and smush my face into it well enough
that we can cast it in gallium.
But I do have a couple other things I want to try.
I have a bunch of colored sand
and I actually just want to see what it looks like
pouring the molten gallium into that colored sand,
so I'm going to do a few experiments with that too.
[Music]
The sand is so much lighter weight that it's actually just floating on top.
[Music]
Gallium pours into sand fairly interestingly,
the sand sort of floats on top of it.
We've seen that it does not behave the same way with kinetic sand,
especially if we smash it down.
So let's take all of our kinetic sand,
put it in this box and see if I can make a mold of my face.
[Music]
I've got two methods that we're going to try.
First, I'm going to see what happens if I actually just smush my face down
into this sand.
I'll hold my breath, keep my eyes closed,
and press my face down in, see what sort of indentation I can get.
Now, the sand has some good give to it
but so does my face, so do all faces.
So, I'm afraid that may or may not work out too well,
but I do have a plan B.
But let's try this, take off my glasses,
got a towel for when I pull my face out
so I can just wipe it all off.
Things I do for you guys.
[Music]
It's like if I were turned into Voldemort...
And Voldemort had a beard.
You can see all my facial hair, it picked up all the details-- Like,
my whole face is so smashed flat.
So, smushing my face down into this sand gave an impression
of an extremely smushed face.
That's not quite what we're going for, entertaining as that is to look at.
Uh, so we do have a plan B.
Several years ago,
helping out in a friend's makeup class,
I had this made.
This is actually a copy of my face, if my face had no hair on top,
no eyebrows, no facial hair, nothing.
But that's me right there.
[Music]
This is made of...
What I believe is called Ultracal, it's sort of a cross
between plaster and cement.
It's really really hard, much harder than my face
and much harder than the kinetic sand.
And so, if we press this down into the kinetic sand,
we should just get a nice imprint without any deformation.
We're going to do that now.
We're going to get the sand back to being fluffy
and then we're going to set this up
so we can tip it down and just smush it down into the sand
and hopefully get a nice, clean, unsmashed version
of my face in the kinetic sand.
[Music]
We've got the face smushed in pretty good,
and I'm just trying to smush down all the rest of the sand,
so it's properly reinforced and will hold its shape.
That's all right.
I'm just gonna kind of...
Grab me by my ears here and...
[Music]
We have my face smushed into the sand, and in theory,
my current actual face should fit nicely down into that,
and I'm going to see if it does.
[Music]
That fits quite nicely.
I guess I shouldn't really be surprised,
it's my face after all,
but like it-- It goes down in and...
I can just feel it lightly touching all parts of my face and maybe
getting pink sand on it, I don't know about that.
But now, we're going to round up all of the gallium that we have
and slowly carefully pour it in there.
That way we'll have a metal cast of my face.
[Music]
Random fact, kinetic sand is made out of 98 percent regular sand
and 2% Polydimethylsiloxane,
an important component of silly putty.
That is as full as we can get it.
Okay guys, my face has now been poured in gallium,
and we need to let this cool down, and that actually takes quite a while.
The gallium, when it's in a liquid state likes
to hold on to it for a while.
And so, it's going to take some time for this to all freeze back into a solid block.
Once it is, we can pull it out of the sand and see
if we have a metal cast of my face.
Okay, I think it's time for the main event.
Let's try pulling this face out.
[Music]
Our sand's sticking to it, but I think we've got something
face-like showing up.
[Music]
Well, I... Think that worked out pretty nicely.
Now, it's a little bit hard to see the similarities when you're just looking
at an all one color face that doesn't have the rest
of the head or hair on it.
But, I think that did a really good job
and you can see pretty much just the same shape.
[Music]
Now I have my lovely metal face to go along
with my lovely concrete face, and my okay skin made face.
I want to see if I can't polish this up just a little bit
so we can have like a shiny metal look.
[Music]
Casting my face in kinetic sand, that actually worked really well.
Of course, we had to use my stone-like face to really get the mold
because I was getting a very smushed look when I just press my face down
into the kinetic sand.
Although, that was pretty fun too.
But overall, I think we had a great result.
I don't know what I'm going to do with a metal face of myself,
but it's pretty neat.
This kinetic sand works really well for casting gallium.
Gallium melts at such a low temperature like 85 degrees Fahrenheit,
that it doesn't burn the kinetic sand the way
like molten aluminum does.
There may be some other things that will cast really well
in kinetic sand too.
We'd love to hear your ideas of what you'd like to see us try.
It is still a granule sand, so we don't want to do things
that are too liquid.
I suspect most types of resin would just seep right down
through the sand, but maybe if we
compact it enough that wouldn't happen.
We also made some time aside to show you how to make one
of these things for yourself.
We've already got a stone cast Nate.
Maybe we'll make a stone cast Grant.
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