Dreaded PINK Spots?

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mercury52

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Hi everyone. Been trying my hand at soapmaking for a few months now, with generally very good results. Have learned a lot, but still have a ways to go.

Made my biggest batch to date yesterday - about 15 pounds total. The batch was poured into a few different molds.

Most of the batch went into a twin 5-lb silicone loaf mold (10 lbs total) with excellent insulation. Then a large amount went into a standard Crafter's Choice 2-lb silicone loaf, which was also well-insulated. A small bit of remaining batter was put into a 10" square silicone mold, and it was barely insulated.

Overall the batch seems to have worked pretty well. The soap in the twin molds appears to have gone through a complete gel phase - it's not ready to come out yet though. The 2lb loaf went about 99% through gel, with just a few edges and corners not quite getting there.

The square mold went through a partial gel phase - to be expected due to the small amount of soap in the mold and the lack of insulation.

Now here comes the problem - the soap from the square mold has developed a pink hue along the edge/corners of 2 opposite sides. Most of it looks fine. Photos attached.

I don't think this is DOS, because all of my oils are recently purchased and well within date. From what I understand, DOS shouldn't show up in 24 hours of making the batch, and it would also be spotted. This coloring is also decidedly pink, not orange, and also not spotted.

This was a fairly low-ingredient recipe, consisting of Olive Oil, Coconut Oil, and Soybean Oil. Lye solution concentration was 2.5:1 with purified water and I used Crafter's Choice Oatmeal & Honey FO, as well as some Oat Bran for exfoliation. No colors/micas/clays.

Since the majority of the batch looks totally fine (the 2lb loaf has also been unmolded, and shows no sign of anything pink) my best guess is that it's some kind of reaction between the soaps and this particular square mold? It's the first time I've used the square mold, so I don't have any other batches that have gone into it to compare against.

Any thoughts are very much appreciated!

PinkSoap1.jpg


PinkSoap2.jpg
 
Yes, the mold is an opaque grey. Sort of an elephant grey. The 2lb loaf mold is a translucent clear (never any issues with that, it's been my primary mold up to now). The twin mold is green. This is also the first time using the twin mold, so I don't have any reference for that.

In my searching, I have found some other instances where users have had pink coloring/spots appear on their soap when it came in contact with black paper. That pink was much brighter than what I'm experiencing here. But maybe grey + fresh soap is a more subdued pink?

My best guess is that it is some sort of reaction between the soap and the mold coloring. If it is, does it seem likely that with repeated use that will go away? Or would most of my soap in this mold be doomed to the same results?

I'm not terribly concerned, as the mold was bought as an "overflow" mold to be used for my own testing/samples. If the discoloration is harmless, I'll keep it for my own purposes, and just be sure that no soap that is going to others is made in this particular mold.

Thank you!
 
I have this happen periodically when using lard in a lined mold, so it was not colored by dye transfer from the mold, I do not work with soy oil and wonder if something in it can cause a color change. If you suspect it being a color transfer from the mold I am not so sure I would continue using it as it most likely will not improve and and mold dyes are made wtih who knows what. The lye may be interacting with the mold. We used to make huge urethane molds anywhere from 4'-20' for freeway concrete work. Anyway our partner decided we needed a new color for our molds, and the green color transferred off onto the concrete when the contractor poured 20' plus freeway sound walls. Cost us a huge sum of money and grief to correct the problem.
 
Since the color is grey, I really can't see that being the cause but anything is possible. I've heard that with repeated use, some molds will eventually stop transferring color.
I doubt its harmful, I would be comfortable using those bars.
 
Thanks for the additional feedback.

I definitely think it's something in the mold - as it's the only variable with the batch as a whole. I don't think it's color leeching per se, but rather some sort of reaction between something in the soap (the lye or one of the oils?) and the color, material, or some additive/component in the mold. What's weird is that the mold was bought from Brambleberry, so it's not as if it's some random mold that I pulled from a kitchen supplier that shouldn't be used for soap.

If the mold gets any future use, I'll definitely keep a close eye on the results, and more than likely will just plan to use the mold for small amounts of extra soap in a recipe for personal use. I have plenty of other molds though, so I definitely won't be rushing to use it again.
 
Hi everyone. Been trying my hand at soapmaking for a few months now, with generally very good results. Have learned a lot, but still have a ways to go. Made my biggest batch to date yesterday - about 15 pounds total. The batch was poured into a few different molds. QUOTE]

Why are you making such a large batch of soap ? I would suggest you keep it to about 1 kg for each batch until you get the hang of it and that will save you money if you have a failure.
 
Hey there, thanks for the feedback. Overall that's exactly what I'm doing. Each new recipe so far has been a 2lb loaf, about 1kg.

This batch was a recipe that was among the first I made. Making such a small loaf yields very few bars for me to test personally, or to give to family/friends for their feedback.

My mother-in-law really loved this recipe, so asked for a bunch more. Since I'd made the recipe with success previously, and have been making a ton of batches these past few months, I felt pretty confident in taking on this recipe for a larger batch.

Brand-new recipes will continue to be 2-5 lbs (1-2kg) for now. Aside from the little discoloration issue in the one mold, the rest of the big batch turned out great and the rest of the process went really smoothly.

Quick update - after a couple of days out of the mold and drying in the air on a rack, the pink has disappeared from the soap! Any parts that were pink are now the same dark color as the gelled center of the soap. So whatever it was turned out to be temporary.

Still not the most attractive square of soap ever due to the partial gel, but that was expected from the get-go.

Thanks for all the help and advice.
 
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