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Filtering Beeswax

This page is credited in full to Dave Cushman who created it. His voice is expressed in black colour text and any additions or comments in blue belong to myself. Credit: Dave Cushman’s website.

PH.

 

Filtering Beeswax

To produce candles and polishes we need clean wax (a good colour and smell helps as well).

If we are making cosmetics for human use, or foundation for our bees then sterility is also a desirable property.

There are many ways of “cleaning” beeswax… And some of the earlier stages are dealt with on the page entitled Melting Beeswax. The rest of this document assumes that our starting point is beeswax blocks with a small amount of dark inclusions on the under surface.

Beeswax is a mixture or alloy of long chain hydrocarbons produced by the bees from carbohydrates. By the time we beekeepers come to use it, the pollen and propolis that has come into contact with it has stained it various shades of yellow through to orange. The temperature at which we process it can also affect the colour.

Temperatures should be kept low, just a few degrees above the wax melting point (63 C). say 75 C. Beeswax is permanently damaged and turns a chocolate brown colour at about 120 C. I have tried many methods to recover the original wax colour, however I have never managed to achieve anything, but a slight lightening after many repeated attempts.

Bleaching and removal/degrading of chemical residues is dealt with on the page decontaminating wax.

Steaming the wax to melt it gradually with the steam and condensed hot water coming into contact with all the wax as the melted surface runs off under the influence of gravity is a pretty good method with light wax resulting. This is described in the Syston steam melter.

I have a temperature controlled honey warming cabinet that I use instead of an oven. I use a large metal funnel (400 mm dia) with the stem filled with cotton wool. This is very slow, but gives superb quality.

Dissolving… Beeswax readily dissolves in Carbon Tetrachloride (CCl4) and the resulting liquid will flow more readily through a filter.

A honey warming cabinet can be utilised or an electric domestic oven, providing that the thermostat can be set to about 75C This can be used to liquefy the wax and convenient filters may be made using empty food cans that have had both top and bottom removed using a tin opener, and any sharp edges have been hammered flat. Pierce two holes at one end just inside the rim and 180 degrees apart. Pass a piece of string through the holes to form a handle and knot the ends, These tubes of tinplate then have a filter membrane stretched over the bottom end which can be a square of surgical lint (fluffy side up) (lint used on wounds that are to be bandaged), some sorts of paper towel or “Nappy Liners” are also suitable for this process. Hold this membrane in place temporarily with a rubber band and secure firmly with twine so that it cannot leak. To use… fill each prepared tin can ‘bucket’ with chunks of wax broken from your large blocks that have been through the first stage of the process. Use smart blows from a hammer on a cold and frosty day to create your fragments. Repeat this about 24 times and hang the ‘buckets’ from one of the oven shelves or place the cans on a grid shelf in the upper part of the oven or warming cabinet with a large meat tray in the bottom portion to catch the drips of wax as it slowly melts and filters through the cloth or nappy liner. As the wax melts add fresh chunks to each bucket. The used filter pads make excellent fire lighters.

Graded Filters will help as the use of a fine filter will soon slow down the filtration operation to a very slow crawl. A succession of filters that get progressively finer will allow each stage to remove particles that are appropriate to the filter pores. I once made a filter column using tin cans that had lever lid closures. The bottom was cut out of each can and the lids were perforated and soldered in position so that each can could be plugged into the top of the stage below it. Each individual can was filled with wadding or cloth discs and each can had a heating trace wrapped around it next to the metal which was then insulated with many layers of corrugated cardboard in order to retain heat and to stop the wax solidifying. These cans were quite large as they originally held 500 gm of instant coffee granules.

Hydrogen Peroxide
In the past dark wax has been lightened by warming the wax over water at just below boiling and then hydrogen peroxide is added, which boils forming millions of very small bubbles that rise through the molten wax. This action “wets” water soluble particles that were suspended in the wax and allows them to separate. There is also a bleaching action as the “spare” oxygen is released.

Another method used for cleaning wax is melting and admixture of “Bentonite” particles followed by filtration under pressure.

A third method that is used is filtration through a filter bed that is made of “diatomaceous earth”.

The use of Hydrogen Peroxide is seriously not a good idea, the wax resulting has water retained inside the structure and the mess it makes whilst burning has to be seen to be believed. You might sell a few candles made from it but trust me word will very soon get round and your market will die with your reputation.

PH

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