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Selama mengajar, banyak murid yang gagal karena fragrance
oil, karena itu kebetulan sekali soapqueen menulis artikel ini.
Note about testing: We tested all of these (non-Bramble
Berry) fragrances in 1 pound batches using our Lots of Lather Quick Mix
Exhibit A: Acceleration
Acceleration occurs when a fragrance oil brings the batter
to trace extremely quickly — sometimes too quickly to work with! In the case
above, the fragrance oil thickened the batter to the consistency of pudding
almost immediately after being mixed in with a spoon (notice the top left
photo). Just to see how thick we could get it, we took a stick blender to it to
see if it would seize, which is a more advanced form of acceleration. Seized
soap is the more like the texture of Play-Doh or clay, and at that point it’s
almost impossible to pour into a mold or work with at all. In this case, the
fragrance got fairly thick, but we still managed to glop it into the mold. If
you have a seizing or accelerating fragrance, just get that batch into the mold
as quickly as you can. Be prepared for it to heat up quickly. Often there is a
correlation between the acceleration/seizing and excessive, quick heat in your
soap batch. On to the next one!
Note: Although we stick blended the batter for the purpose
of experimentation, we generally do not recommend stick blending fragrances
into your soap batter. It can cause even the most well-behaved fragrance oils
to accelerate or seize up.
A closer look at accelerated soap. Notice that thickness!
The
work around: Although the fragrance did accelerate trace, the batter itself was
not unworkable. While it wouldn’t be suited to a design with intricate swirls,
a thick batter like this would be well suited to simple soap design, such as a
straightforward layered soap or a solid-colored soap.
Exhibit B: Ricing, intense discoloration
This batch was an excellent example of ricing. Ricing occurs
when an ingredient in the fragrance oil binds with some of the harder oil
components in the recipe to form little hard rice-shaped lumps.
Up close & personal with ricing. This batch looks like
tapioca pudding!
The work around: Often, ricing can be stick blended out.
However, in utilizing the stick blender to smooth your soap out, you may end up
with a much thicker trace than expected. Notice the photo in the bottom
right-hand corner of the collage — the soap was as thick as pudding after we
stick blended the rice granules out. We managed to spoon it into the mold and
it retained a relatively smooth texture.
This soap is also a great example of the discoloration that
can occur as a result of vanilla content in fragrance oil. It may look like a
nice creamy white in the mold, but after hardening for a few days this soap
turned chocolate-y brown. Scroll down for final photos.
Exhibit C: Separation, ricing and seizing
Out of all the fragrances we tested, this one was definitely
the most misbehaved. It’s hard to tell from these small photos, but the batter
showed separation almost immediately. Separation occurs when the fragrance oil
can’t be mixed into the soap batter, and oil slicks can start to pool on top of
the batter. It looks much like cream of wheat with butter on top! Separation
can look a lot like ricing, and the two sometimes occur together. The main
difference between them is you can see pools of oil on the soap with separation
— it almost looks like it’s falling apart.
This is from a different batch of soap, but it shows a more
intense example of separation. Notice the pockets of oil where the fragrance
oil is pooling around the batter.
After we stick blended this batch, the batter started to
seize. This is true seizing because the texture was beyond that of pudding like
the other two; at this point it almost looked like gritty Play-Doh. Yuck!
Seizing at its finest!
The work around: This
batch had so many issue that it would be hard to salvage. If it’s not lye
heavy, making it into rebatch is always an option (for more on rebatch, check
outthis tutorial or this Soap Queen TV episode). If you determine it’s lye
heavy by doing a zap test or using a pH strip, consider making it into laundry
detergent, which is easy to make and ensures no soap goes to waste. If the soap
is fairly soft and fresh, Hot Process Hero is the way to go to salvage the
batch. It’s a variation on the traditional hot process method that creates a
rustic bar of soap.
The Final Soaps
So how did these three batches fare after being scooped into the mold and allowed to harden? Check it out below:
Immediately after being glopped into the molds. From left to
right: Exhibit A, Exhibit B, Exhibit C
After being allowed to harden for 2 days. From left to
right: Exhibit A, Exhibit B, Exhibit C
Notice that after it hardened, Exhibit A’s fragrance oil
caused intense gelling in the middle of the soap. The fragrance also formed
small brown spots throughout the soap. Exhibit B fared the best of the bunch,
but notice how brown it turned! Finally, Exhibit C struggled the most. The
texture was rough and almost crumbly.
From left to right: Exhibit A, Exhibit B, Exhibit C
Just for fun, we cut into each soap. Exhibit A went through
gel phase in the center (notice that dark, oval circle) as well as
discoloration from vanilla content in the fragrance oil.Exhibit B went through
textbook vanilla discoloration, showing the dark brown on the outside and
creamy white in the center. Exhibit C was so thick when it was poured that
there were bubbles throughout — notice the small hole where an air bubble was
trapped.
Bonus bad soap behavior
Alien Brain: Not only do we get fragrances to test, we get
various oils and butters too. This soap was made using pumpkin seed oil, and it
caused a crazy phenomenon called Alien Brain. Alien brain happens when the soap
overheats, which is clearly what happened here. Notice that the entire loaf is
gelled throughout! The great thing about Alien Brain though is that it is a
purely cosmetic issue, and does not affect the rest of the soap. With a little
steaming to get rid of the soda ash, this soap would look great!
Soap
Volcano: Natural sugars (including fruit purees) and alcohol in cold process
soap can super heat the soap and cause what’s known as a soap volcano. This
soap had pumpkin puree in it, and the mini soapy eruption was relatively mild.
Once unmolded,we simply cut a few inches off the end and the soap was perfect.
In other instances though, the sugars can super-heat the
batter so much that it causes the soap to overflow out of a mold into a soapy
lava flow. That’s what happened to thiscoconut milk soap:
With gloves on, you can scoop the soap back in as it starts
to deflate. Or, Hot Process Herothe soap out when it’s fully cooled.
General tips for good soapy behavior
Although some fragrances will inevitably cause issues, there
are a few things you can do to ensure you get well-behaved batter.
- First, make sure you are soaping at lower temperatures. We like to soap when the lye water and oils are about 120 degrees F. When soaping at hotter temperatures, you run the risk of accelerating trace, creating a heat tunnel or causing a soap volcano.
- Double check to be sure your recipe checks out with the lye calculator and that you are using the recommend amount of water. Water discounting can cause the batter to accelerate.
- Take the fragrance oil for the batch and mix it with an equal amount of liquid oil (you can pull it out of the regular recipe or just add extra superfatting oils) and heat the mixture up for 20 seconds in the microwave to bring the temperature of the fragrance up so it’s not quite as cold when the product is added to the soap batter.
- Whisk in fragrances and colorants after the batter reaches trace. Even the best recipes and fragrances will thicken up if you stick blend them too much.
- Using recipes with lots of soft oils, such as Olive, Sunflower or Rice Bran, tend to maintain a thinner trace longer.
