Tag: clear ice

Making Clear Ice Without a Cooler
In a set of experiments, I showed that you can make clear ice by controling the direction of freezing. The container I've been using for this is an Igloo cooler. When using it, the ice freezes from the top-down and all the cloudiness in the ice forms at the bottom of the container rather than in the middle of the block.

I wanted to show that you can do this without a cooler as long as you have some sort of insultation that accomplishes the same thing as the cooler. In this case, I chose a bigger pool of water as an insulator.

As a control I froze a plastic take-out container of water in the freezer.

As usual, it is cloudy over a large area, mostly in the center. This is because the water freezes from the outside-in. The last part of the ice to freeze contains air and any impurities, and is cloudy.

So then I took the same container and put it into a larger container. The smaller container sits on cubes to keep it off the bottom of the larger container.

Both containers were filled with water to about the same level. The purpose of this is to use the outer container of water as an insulator. The water inside the smaller container would then freeze only from the top-down instead of outside-in, because the water surrounding it would freeze later (because it is so big).

The results show that this worked- the cloudy part of the ice was the last part to freeze at the bottom of the container.

What this means:
- Directional freezing works as long as there is an insulated jacket around the container. The ice freezes only from the top-down, pushing the cloudy part to the bottom.
- This property could be exploited to make an ice cube tray that makes cloudy-on-the-bottom ice. Picture, for example, an ice cube tray that was insulated with a jacket on the sides and bottom.
- So now I can do more experiments to make an insultated jacket that is practical.
An index of all of the ice experiments on Alcademics can be found here.
October 22, 2010
Freezing Objects in Ice

As you know I've been making clear ice at home. I've got a lot more experimenting to do, but for now I thought I'd try freezing a bottle inside a block.

I started with a mini bottle of Chambord, since it's the flashiest one I own. I tied a piece of fishing line around the neck of the bottle and suspended it in my ice-making cooler. I tied the top around a ruler to hold it above the cooler.

Happily it stayed in place while freezing. I popped out the block.

This block was cloudier than usual. I'm not sure if that's because of the object in the ice or not.

It looks a little better close up, so I cut the ice closer to the bottle.

It's not perfect, but it would make a great chunk of ice for a punch bowl.

An index of all of the ice experiments on Alcademics can be found here.

September 28, 2010
A Homemade Giant, Crystal Clear Ice Cube Tray
As you're probably aware, I've been dabbling in experiments making clear ice at home. [update: An organized index of ice experiments on Alcademics can be found here.] The way I've found that works best is to freeze ice in an Igloo cooler with the top off. (Please read the post before you tell me to boil the water in the comments- it doesn't work.)

This is now how I make all my ice at home- I haven't used trays in months.

Now I am working on ways to best carve ice and also trying to create an ice cube tray that will work in this directional freezing system. I found a method that works that I need to perfect.

Here's what I've done.

I went down to The Container Store and purchased these plastic gift boxes. They're 2 inches by 2 inches wide (4.5 centimeters) and around 5 inches tall (11.5 cm) with the tops off.

These I put in my Igloo cooler. I've done it with the open top of the container facing up, and also facing down. Facing down works better, actually, because the air in the rectangles gets pushed out the bottom. Facing up, you get a 1cm cloudy patch at the top of the cubes. No big whoop.

Then I fill the cooler with water and freeze it. It comes out as a block of ice with the cubes stuck in it.

These separate surprisingly easily from the block.

Also surprisingly easy is how the ice pops out of these plastic containers. I just leave them upside-down for a couple minutes and the ice cubes slice right out.

As you can see in the above picture, there is a little bit of cloudiness when the trays are left with the open part facing up. I repeated this experiment with the open part facing down and there was less cloudiness. Either way, there isn't much to worry about as it can be cut off when cutting these big long cubes down to 2 inch by 2 inch by 2 inch ones.

Conclusions:
- These ice cubes are fricking awesome.
- I need to try it with cutting off the bottom of the containers so that they're a rectangular tube rather than a box.
- I think this is actually scalable to make an ice cube tray with some tweaking.
- Hooray!
An index of ice experiments on Alcademics can be found here.
August 27, 2010
Ice Meets Chainsaw

Ice nerds got a real treat this Tuesday, for Andrew Bohrer from Seattle was guest bartending in San Francisco along with Amanda Womack from Cask.

He brought chainsaw Thursday to the city in order to chop up giant blocks of clear ice from an industrial ice maker into big cubes that could be further cut into ice balls.

Keep scrolling for videos of hand ice carving… or click here for an index of all of the ice experiments on Alcademics.

First they cut slices off the big blocks, then cut those into long rectangles. Then they cut those into cubes.

Click below for the videos.

(more…)

August 12, 2010
Percent Cloudiness in Top Frozen Block Ice

I'm somewhere along the process of creating an ice cube tray that takes advantage of the top frozen ice that I make in an Igloo cooler. As the cooler lid is off when I freeze water in it, the water freezes from the top down like a pond in winter. The cloudy part of the ice (where air an impurities migrate as the water freezes) are only in the bottom of the block.

In the below picture the block has been turned upside-down after removing it from the cooler.

Most of the time when making ice for myself at home, I leave the cooler in my freezer for a couple of days then dump out the ice before the bottom portion starts to freeze and get cloudy- that way the entire block of ice is clear and I don't have to cut any of it off.

In a recent set of experiments, I wanted to see what percent of the block of ice was cloudy if I let the block freeze entirely. So far I've done three measurements.

As you can sorta see, a portion of the ice has bubbly streaks in it but is mostly clear, then there is an all-cloudy last bit.

Trial One:

Total height = 3.75 inches
Somewhat cloudy =  last two inches
Very cloudy, unusable = last 1/2 inch
Percent unusable cloudiness = 13%

Trial Two:

Total height = 6 inches
Somewhat cloudy =  last three inches
Very cloudy, unusable = last 1 inch
Percent unusable cloudiness = 17%

Trial One:

Total height = 6 inches
Somewhat cloudy =  last two inches
Very cloudy, unusable = last 1 1/2 inch
Percent unusable cloudiness = 25%

So we're looking at an average of 18% of the ice is too cloudy to use in a cooler of this shape and size.

Why might this information matter? If I develop an ice cube tray that fit into this cooler I would want to be able to remove the last cloudy bit so that it wouldn't get into the ice. I wanted to know about how much waste we're looking at.

But one thing I'm learning with repeated experiments is that by freezing from the top down the water expands and puts a lot of pressure on the bottom of the cooler. (Think of how a plastic bottle will bulge when put in the freezer.) With repeated experiments that cooler is starting to warp on the bottom, plumping out in the center. A better freezing vessel would be flexible on the bottom.

To see all of my ice experiments use this link.

August 3, 2010
The New Alcademics Banner

My experiments with ice continue. I've got a routine down to make clear chunks of ice and now I'm experimenting with freezing objects into it. As you can see I have some room to improve but I did make a groovy, if a bit large, new banner for Alcademics.

May 14, 2010
Is Faster Frozen Ice Less Cloudy than Slower Frozen Ice?

In the last installment of my ongoing adventures making clear ice at home in the freezer, I found that using a hard-sided Igloo cooler works pretty well to create large, mostly-clear blocks.

I was curious to see if faster frozen blocks (with the freezer turned to its maximum cold setting) would come out more or less cloudy/clear than blocks frozen at the minimum cold setting.

Of course, my freezer isn't exactly high-tech. According to my novelty jumping bass fish thermometer I picked up in Finland (thanks for the trip, Finlandia!), my freezer only ranges from -3.2 to 2.2 degrees Fahrenheit.

Anyway, as you can see below, there wasn't much difference at all. Here's the block set on the warmest freezer setting (slowest to freeze):

And here at the coldest setting, which froze faster:

My finger (I should be hand model, right?) indicates where I'd cut the block to get rid of the too-cloudy ice. One was 12 cm and the other 12.5. At that difference, you may as well turn the thing all the way up and have your ice sooner.

More icesperiments to come!

An index of all of the ice experiments on Alcademics can be found here.

January 5, 2010
Inside the Freezer of an Ice Nerd

Well I certainly wouldn't want any food in there spoiling the flavor of my ice that I spent so much time making.

January 3, 2010
Clear Ice Blocks at Home in an Igloo Cooler
This post describes how to make a clear block of ice using a picnic cooler. Since I first wrote it in 2009, I have figured out a lot about ice, but this was the defining post for what would become known as "directional freezing." What is Directional Freezing? (the basic theory behind clear ice).

An index of all of the ice experiments on Alcademics can be found here. It's also a great place to start.

Before I figured this out, I tried many other experiments.

Early experiments were:
And I had success with:
- Releasing Air Trapped in Ice
- Cutting Corners to Make Clear Ice
I also learned some ways to cut ice into big chunks.

Now I am trying to refine what I call the Pond Method, the concept that if we freeze water from the top down only (and not outside-in), all the trapped air that makes cloudy ice will be the last to freeze on the bottom of the container, rather than in the middle.

In the last attempt I used a collapsible beer cooler. I had good success in getting clear ice, but found it really hard to get the ice out of a cooler.

This time I tried freezing water in a hard-sided plastic Igloo picnic cooler. Initially I left the cover closed, but after two days it had only barely started to freeze (a good sign for its insulating abilities) so then propped the cover open.

After a few days when the water looked almost completely frozen and I could see some cloudiness forming at the bottom, I removed the cooler from the freezer. I turned the cooler upside-down and waited for the ice block to drop out of the cooler. Presto! It was ready.

There was a little unfrozen water at the bottom of the block (with only about a centimeter of ice covering it). This was easy to drain.

Then I just cut off the bottom cloudy part and had a big chunk. Easy!

Once again, the secret to cutting ice is to score it about a centimeter with a knife or saw, then chip it away with an ice pick and hammer.

Conclusions:
- I'm really surprised the cooler didn't crack after the ice expanded, but maybe it didn't because there was a little unfrozen water remaining.
- This Igloo cooler is a totally workable vessel for making clear ice blocks in my home freezer. Hooray! Luckily it is of a shape that allows for easy removal of the ice block.
Future experiments:
- In this first experiment with the cooler I set the freezer temperature on the lowest setting. I'll see if this matters for clarity or if I can use the high setting for faster freezing.
- I also want to try a disposable Styrofoam cooler (if I can find one this winter) just because there is no worry if it cracks, and this is the most reproducible vessel for other people to try at home.
- I should attempt to find a flexible insulating material that can be made into other shapes, such as a tall and skinny shape (thermos?) that would more easily fit in the freezer and can make smaller cubes.
Here are more clear pictures of the ice pulled out of the cooler with some of it unfrozen, and it after smashing off the unfrozen part.
December 28, 2009
Carving Big (and clear) Ice Cubes

After much experimentation I have found one method to make big clear chunks of ice. That method is to put water in a cooler in the freezer, then chop off the top clear layer. Now the trick was to get this into useful sized cubes for glasses.

*Update 2021: A better post on cutting up clear ice is here.

Starting with the slab of ice (this one about three inches thick),

I used a heated bread knife to score the ice just about 1/8th of an inch,

Then tapped the scratch in several places with an ice pick and found it separated really easily.

And I got the whole thing chopped into long spears.

I use these really long ones in a tall glass

and scored and cut the rest of the spears into big fat cubes.

Hooray! Time for a drink.

An index of all of the ice experiments on Alcademics can be found here.

December 2, 2009