Egg - Yolk Separator




Introduction: Egg - Yolk Separator

Ever tried separating egg yolk under time pressure? What was your succes rate?
Ever tried separating more than 10 eggs without getting bored?

This instructable will show you how to make a device that separates egg yolk from egg white. It is based on the principle that egg yolk has a larger density than egg white. Once the egg plunges into the separator, egg white will come oozing out leaving egg yolk behind.

NOTE 1: Sometimes the egg white may contain some yolk. If your recepy requires pure egg white, it might be ruined. The device is a great yolk separator but sometimes a poor egg white separator.

NOTE 2: Whilst writing this instructable someone pointed out that a similar device is already for sale in specialised shops. However, since mine is nicer and for free, I decided to publish anyway!

Step 1: What Do You Need?

You will need a cup that meets the following specification:

1. Stainless steel or plastic (food grade) for hygenic reasons.
2. Fairly wide top (opening) as you have to pour the egg into the cup. If it is to narrow, you'll end up spilling part of the egg. An opening of 6 cm works fine.
3. The height of the cup should be so that it can easily contain an entire egg.

4. A fine saw to cut stainless steel.
5. Optional:  an iron vile.

Straingely enough, the shape of a large egg seems ideal.

Step 2: Making the Device

From experience, an average egg yolk is about 30 ml (depends on the size and class of egg).

Take a conical or spherical stainless steel cup. In my case I used an egg timer (how appropriate) that didn't work anymore.

Get the top of and fill it with 30 ml of water to mark the cutting line. If your eggs are larger / smaller, adjust this volume.

Mark the 30 ml line, take an iron saw and make a cut about 3,5 cm long and 0,5 cm wide. Make sure that the edge is not rough (vile / sand optionally).

Step 3: How It Is Operated.

You will have to be able to open an egg with one hand as most cooks can...

With one hand break the egg on the edge of a cup (this requires a bit of skill) and let the entire egg plunge into the separator. You will notice that once the egg is dropped into the separator, the egg yolk will sink to the bottom beneath the cut and remains unharmed. Especiallly since the egg yolk is contained in a skin which makes it sink as a "homogeneous ball".
Meanwhile, the egg white will immediately start to overflow through the cut. 

Now gently make circular motions with your wrist to rotate the egg white towards the cut. After spinning it about 3 times, most of the white is out.

In fact the principle of this device is the same as separating yolk in the traditional way: the egg white is cut over the edge of the remaining egg shell.
However this device works faster as it works in 1 step.

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    11 years ago on Introduction

    if you have a steady tender hand than you put all the eggs in a bowl and scoop the yolks out with a spoon, its fast and easy with minimal practice, i leand this from a baker who would need hundreds of fresh egg whites a day for meringue and royal icing


    Reply 11 years ago on Introduction

    be careful, its a pain if you break a yolk in the bowl


    11 years ago on Introduction

    138.Egg-based Gelled Flame Fuels                             by The Jolly Roger
    The white of any bird egg can be used to gel gasoline for use as a flame fuel which will adhere to target surfaces.
    Materials Required:
    Parts by Volume                     Ingredient                   How used               Common Source     
    85                                              Gasoline                            Motor Fuel                 Gas Stations
                                                                                             Stove Fuel                 Motor Vehicle        
    14                                              Egg Whites                       Food                          Food Store            
                                                                                             Industrial                  Farms                   
    Any one of the following:                                                                                                                  
    1                                                Table Salt                         Food                          Sea Water            
                                                                                             Industrial                  Natural Brine         
                                                                                             Processes                  Food Store            
    3                                                Ground Coffee                   Food                          Coffee Plant          
                                                                                                                             Food Store            
    3                                                Dried Tea Leaves               Food                          Tea Plant               
                                                                                                                             Food Store            
    3                                                Cocoa                                Food                          Cacao Tree            
                                                                                                                             Food Store            
    2                                                Sugar                                Sweetening                Sugar Cane            
                                                                                             Foods                        Food Store            
    1                                                Saltpeter                          Pyrotechnics              Natural                 
                                                     (Potassium Nitrate)            Explosives                  Deposits                
                                                                                             Matches                    Drug Store            
    1                                                Epsom Salts                       Medicine                    Natural                 
                                                                                             Mineral Water           Kisserite               
                                                                                             Industrial                  Drug Store            
                                                                                             Processes                  Food Store            
    2                                                Washing Soda                    Washing Cleaner         Food Store            
                                                     (Sal Soda)                          Medicine                    Drug Store            
                                                                                             Photography               Photo Supply          
    1 ½                                             Baking Soda                       Baking                       Food Store
                                                                                             Beverages                 Drug Store            
                                                                                             Mineral Waters                                     
    1 ½                                             Aspirin                              Medicine                    Drug Store            
                                                                                                                             Food Store            
    CAUTION: Make sure that there are no open flames in the area when mixing flame fuels! NO SMOKING!!
    1.    Separate the egg white from the yolk. This can be done by breaking the egg into a dish and carefully removing the yolk with a spoon.
    2.    Pour egg white into a jar, bottle, or other container, and add gasoline.
    3.    Add the salt (or other additive) to the mixture and stir occasionally until gel forms (about 5 to 10 minutes).
    NOTE: A thicker gelled flame fuel can be obtained by putting the capped jar in hot (65°C) water for about ½ hour and then letting them cool to room temperature. (DO NOT HEAT THE GELLED FUEL CONTAINING COFFEE!!)

    Reply 11 years ago on Introduction

    And I will keep your RECIPE in mind. You should write an instructable on this.


    Reply 11 years ago on Introduction

    lol he means he was goin to take the idea and make money off of it :D


    11 years ago on Introduction

    I just use my hand after washing then just crack the egg into a cupped hand and the egg white slides over the edge and the yolk stays in the middle of the palm.


    Reply 11 years ago on Introduction

    Yep, your hand is maybe the best separator.  A slotted spoon works well too-- the key is not having anything sharp enough to break the yolk's membrane.

    There is little in the kitchen that is simpler than separating egg yolks from egg whites, and a method or tool that gets some yolk in the whites is not acceptable for many recipes.