how to get rid of DOS

[Guest]

In the second link from p 54 onwards in the pdf document information on how to reduce DOS:

http://cavemanchemistry.com/HsmgSapVal2006.pdf

According to the author of this study to reduce DOS in soap making

Ineffective additives were: Vitamin E, BHA, Sodium Citrate,
Carnosic Acid

Effective Additives were:
• 0.03% EDTA
• 0.07% BHT
• 0.12% Rosemarinic Acid
• When buying ROE, maximize Rosemarinic Acid content if possible
• EDTA was very effective even at very small concentrations

Metal Contamination
• EDTA seems to work by sequestering metals
• Calcium and Iron reduce shelf life whereas Copper has no effect on shelf life
• Use distilled water to reduce Calcium or Iron
• Calcium and Iron may be present in oils or lyes as well as in tap water

also read this one!: http://cavemanchemistry.com/HsmgDos2006.pdf

Best combination seems to be: BHT
+ Sodium Citrate together.... read the link for further detail...

information from ( http://cavemanchemistry.com )

 

[jennikate]

Thanks for the link.

 

[Guest]

Interesting , thanks for the link.

 

[Guest]

Caveman Rocks!!

This guy deserves a soap statue for research!! DOS... the enemy of all soapers... especially those using the lovely moisturising oils so prone to spoilage... hehe... try and see if these preservatives work?

 

[Sunkawakan]

ok, stupid question here - what is DOS?

 

[Rosey]

it's dreaded orange spots. It's when something in the soap has gone rancid.

 

[Dixie]

One author suggests you keep your Iodine level below 70 and you will never have DOS. I have to agree thus far, I have never had DOS and all my recipes are below 70.

 

[ewenique]

Is it true that if you use a soap formula with an Iodine value of less than 70 that the soap won't develop DOS?

Hehe - we posted the same thought at the same time!

 

[TheSoapyEwe]

I try and keep my iodine #54 or below, always.
I also don't use any oils that are known to be prone to DOS, ever.
You can truly get a wonderful bubbly moisturizing bar without them, imo anyways

 

[MikeInPdx]

One author suggests you keep your Iodine level below 70 and you will never have DOS. I have to agree thus far, I have never had DOS and all my recipes are below 70.

I went back through my past year and a half's soaping notes to check this out. The only batches with DOS all had numbers greater than 70. One batch where I used a good deal of DOS prone veg shortening is still keeping fine.....the coconut was high enough to keep the number below 70. Nice soap too.

 

[donniej]

Great find!

 

[xyxoxy]

I went back through my past year and a half's soaping notes to check this out. The only batches with DOS all had numbers greater than 70. One batch where I used a good deal of DOS prone veg shortening is still keeping fine.....the coconut was high enough to keep the number below 70. Nice soap too.

Ha!
I just did the same thing when I read this.
Almost all of my batches are around 50. The only ones in the 70's have higher than normal % of vegetable shortening and little or no coconut. They have all been fine (great in fact) though they may have had some other ingredients with antioxidants that helped.

I've only had one batch in just over a year that had a couple of suspicious spots on a few of the bars. The Iodine level was 62 and included Palm, Olive, Coco, Crisco, and Castor in that order. There were no other additives except a little TD for coloring. And I'm not even sure those spots were DOS or just a discoloration from sitting near a window.

 

[Vintageliving]

Thanks very much for posting the links to Caveman Chemistry. Very interesting!

 

[gekko62]

Some people find T50 Vit E to be very effective. I use either .04% T50 or .1% ROE in every batch,keeping notes so I'll know which is which if DOS raises it's spotty head somewhere down the track. I also add .04% T50 to my oils when I open them.(Haven't tried that with the ROE cos it's a PITA to mix thru). They're not cheap,but you need such a tiny amt & I figure it's pretty good insurance.
DOS has me really worried.I stopped using canola(which I really like in soap) still using a little sunflower,but even olive isn't immune.And with the humid summer months on their way,well,fingers crossed.

 

[Half Caper Farm]

Does anyone have pictures of DOS? It would be useful to know what it looks like. 8)