Just a few days ago I wrote a somewhat detailed commentary (letter #20 in this discussion thread), on the method which I have used to purify beeswax. I wish to use this wax to make new foundation sheets for honey frames. Quite a number of people have added further comments to this discussion since I posted my letter.
A few of the responses have been relevant, such as Beeno’s comment (#23): “good point on the benefits of slow cooling. Makes sense.”
It is easy to find information on how highly valued beeswax is. The price no doubt varies depending on the country where the buyer or seller resides. Very clean wax, for use in cosmetic products, may bring the highest returns. I would rather use any reclaimed wax for making foundation sheets, rather than use it for candle making. I find it surprising how readily some people want to use it as fuel, “fire lighters”. Is it because people think that it is too difficult to recover wax from filter material? Whatever the case, there are much less expensive fire lighters available than those which are impregnated with beeswax.
Some of the comments in this discussion thread have admired clean blocks of wax, and some have been concerned with recovering very pale coloured wax. If these blocks of wax are destined for cosmetic products, then the effort required for multiple renderings may be worthwhile.
However there have been some who warn against the dangers of boiling wax. I certainly agree that wax rendering is an activity which is not appropriate in the kitchen. It would require a great deal of care to never have any spill of wax – whether that is bits of comb, or splashes, or drips of molten wax. There seems to be no shortage of comments about the difficulties which people have had in cleaning up after a wax spill!
So what are the facts? JenkinsBrynmair has made various comments, such as:
“bringing wax to the boil is downright dangerous”,
“even bringing wax up to near 100 degrees is going to cause it to seriously darken and degrade”,
“Boiling the wax will do it no favours at all.”
I believe that we can (and should) learn from the experience of others. But I also believe that we should not blindly follow comments which are demonstrably incorrect. In the pursuit of knowledge I have just performed experiments with some small samples of beeswax. I hasten to add that it was made by bees in Australia, and southern hemisphere beeswax may be different to that made by bees in the northern hemisphere. (I don’t actually believe that such a difference really exists!)
Is it dangerous to heat beeswax? The biggest danger would be the risk of fire. But let me ask a question about other fire risks we might have. Many people enjoy fish and chips. Many people cook potato chips, and a very usual way to cook potato chips is to deep fry them in very hot cooking oil or fat. The process of “deep frying” involves heating the cooking oil to far higher temperatures than the boiling point of water. We all know that it is dangerous to be burned by steam, or scalded by boiling water, so we are cautious, and work carefully with boiling water. Working with boiling water involves temperatures quite high enough to cause dangerous burns, and requires that we work with care. Working with very hot fat requires even more care, because of the higher temperatures, and because of the risk of fire if the fat is overheated.
I placed a small quantity (just a few grams) of beeswax into a metal can, with half a cup of water, and placed that can directly over a strongly burning wood fire in an outdoor fireplace. In a short while the wax was seen to melt as the water became hotter. The fire was burning strongly and caused the water to boil very vigorously, and the flames were licking around and above the open mouth of the metal can. (The can was about 100mm in diameter and about 65mm high, and had originally contained tuna.) I maintained the fire because I wanted to observe at what stage the wax might catch fire. While water remained in the can, boiling very vigorously, and flames continued licking above the can, the wax did not catch fire. It was only after all of the water had boiled away that the wax started to smoke, and then caught fire.
Heating wax in boiling water is probably at the same danger level as boiling water in an open saucepan.
And so I ask, is it true that “bringing wax to the boil is downright dangerous”?
If you asked this question of me, I would say that it is not dangerous, provided that there is a good quantity of water in the saucepan / pot together with the wax.
I would urge anyone who works with molten wax to use caution, to avoid injury. However, I did not “boil the wax”, because wax does not boil in the way that water does. It is true that I heated the wax in boiling water, but the wax did not get hotter than 100 degrees Celsius while water remained in the can. Yes, wax will burn if it is heated to higher temperatures; and no, you do not need to heat the wax above the boiling point of water if you wish to purify the wax.
In my next experiment I took a piece of virgin honeycomb which had been made by bees which I had collected as a swarm. I chose a freshly drawn piece of comb which was very white, and which had not yet been used to store nectar or pollen. I placed this piece of wax, with water, into a clean metal can (similar to the one I had just used). I heated this wax and water until the water was boiling vigorously, and I maintained the wax and water at this temperature for several minutes, before removing it from the fire. When it had cooled, the layer of wax on top of the water appeared just as white as it had been before it was melted.
And so I ask, is it true that “even bringing wax up to near 100 degrees is going to cause it to seriously darken and degrade”?
I have no doubt that if wax is heated for a very long time, or if it is heated above the temperature of boiling water, that it may darken in colour. I have no desire to make my wax darker by overheating it, and to date I have not found any evidence that it has become darker from being “cooked” by me.
For those who wish to lighten the colour of their wax, I have found information that when wax is exposed to sunlight it will become paler in colour. This information confirms what I had already experienced. Some time ago I made a quantity of plain wax sheets, using a smooth wooden paddle, before I made my silicone mould which produces embossed wax sheets. I have not used those plain sheets, and plan to reuse them to make embossed sheets. The interesting thing though is that these plain sheets, which were exposed to sunlight through the windows and skylight of my “honey house”, have been bleached and become appreciably whiter than the yellow colour they had been when I first made them.