Day 12: Hand cream
Well,
the lanolin didn't freeze out overnight, even though we had a very
heavy frost. So we have to try an alternative way of purifying our dark-brown
oil containing the lanolin. Then I have a brainwave. I'll try a
little trick that we chemists often use to purify organic chemicals –
a process called solvent extraction. There's some olive oil in our
storeroom in the sawmill. As we all know, olive oil and water don't
mix. If I take some of the impure lanolin oil, shake it up in a bottle
with some clean brine (water containing table salt) together with a smaller
amount of the olive oil, the lanolin, being a grease (a solid fat), will
prefer to dissolve in the upper, olive oil layer rather than the lower,
water layer.
I can't believe
what happens when I shake the bottle. All of the coloration in the impure
lanolin oil is taken up by the water. More interestingly, an off-white
‘solid' has formed as a separate, third layer between the
olive oil and water layers. Given the amount, this can only be pure (or
at least, much purer) lanolin. The purification process couldn't
have been simpler. All that remains is to decant off the olive oil, and
scoop off the lanolin. If our lanolin contains a little olive oil and
water it won't matter – it will be pure enough for our purposes.
To
make the hand cream, we merely add the lanolin to some molten beeswax
that we've been given. To perfume it, we stir in some tea-tree oil
that I've extracted (using steam distillation) from some leaves
Ellen collected for us. The cooled mixture is fragranced lanolin hand
cream. Not bad, even if I do say so myself.
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