03/08/2026
A few years ago, say four to five years, I made a batch of Castile soap with olive oil, goat milk, and rolled oats.
The soap firmed up more quickly than expected and did not cut into the neat, attractive bars I had hoped for. Rather than waste it, I shaved it into smaller pieces, softened and worked it by hand, then rolled it into soap balls.
At first, I found the old-fashioned shape rather charming.
In reality, they were a little awkward to use. They worked well for handwashing, but I did not reach for them very often.
So they remained with me.
And they continued ageing.
Today, around four years later, I took one out and tried it on my hair.
Rolling a soap ball over wet hair was not especially elegant, and there was very little lather. But as soon as I rinsed, I could already feel how smooth my hair was. It felt almost as though I had used conditioner, even though I had used only the soap.
That smooth feeling remained after drying.
I should be honest that this was my personal experience. I have used handmade soap bars on my hair for many years, and I have learnt what works best for my scalp, hair and washing routine. Someone beginning with a soap-based shampoo may have a very different experience.
Still, this little four-year-old soap ball reminded me why we continue ageing selected Castile soaps for 365 days.
A Castile bar may be cured and usable after several weeks. But pure olive oil soap may continue to dry, harden, and develop long after that early cure.
Not everything valuable needs to happen quickly.
Sometimes time becomes part of the craft.
I have shared the full story in our latest journal article:
Cured in Weeks, Aged for Years
What a Four-Year-Old Castile Soap Taught Me About Time
Read it through The Castile Guide on our website.
Discover what happened when I washed my hair with a four-year-old Castile soap ball, and why olive oil soap can continue developing long after its early cure.