I've seen enough YouTube soapers that seem to add it. At first I was curious and assumed soap was naturally not white, then I started making soap and realized it didn't matter.
In reference to the original question: I have td that is both oil and water soluble, I've used it maybe twice. The first time I cared about measuring and being as precise as my other colors, the second I dumped it in to offset a discoloring fo. Don't think I needed it the first time, the second time my fo discolored anyway.
PM me and we can chat about shipping costs. I have extra TD and I'm willing to send you some for the shipping costs. If you are in the USA a small flat rate box is the cost.
It's water soluble and food grade - not that I would intentionally eat it.
I do not use much and I have nearly a kilo ( it was inexpensive).
Any of them are completely fine to use in soap to either add whiteness or to lighten up a color so that it is more pastel, etc.. I've used each of the 3 types with no issues in my soap. Which one to choose will depend on what medium you desire to use to mix it (water or oil) before adding to your soap batter. Having said that, though, you never have to worry about what kind of TD to buy if you are like me and use vegetable glycerin as your mixing medium (it mixes well will all types).
Like the others have said, though, you need to keep in mind that TD will not make every soap white. It all depends on your ingredients, especially with which FO or EO you choose to use to scent your soap.
I did't know that you can make soap white without TD. Please explain. All the soap making videos I've watched the makers have added TD to the batter to make it white. I have only been using olive oil and coconut oil which does not make the soap white. I have only made 2 batches of soap so far and want to move on to a white base and 2 colored swirls. Some TD I have researched is so cheap and some is so expensive. Exp. $4.25 for 1 oz and then some $8.95 for a lb. Then I've seen some that comes in blocks, what does one do with that? Thanks for any light you could shed on this for me.
Is a link to inexpensive water soluable TD. The particle size is small enough with this that you will not suffer from abrasion with it in your soap. Smaller particles is better with TD. TD also have a high affinity for water ( think of it as being thirsty) so when you use it you will want to remember that.
The olive oil you are using will cause your soap to be light green (ish). That's where most of the off white coloring is probably coming from.
Milk will cause some discoloring as will honey. Are you using any additives like that?
Using any type of vanilla will discolor soap brown over time. It's just oxidation and there's no stopping it.
Lard and tallow make a very white soap as does coconut oil. I do not have experience with every oil/fat out there but most of the vegetable oils do not have the olive oil green effect.
If I want a white soap, I use lard, coconut oil, regular olive oil (not extra virgin), and a light colored oil - usually high oleic sunflower or sweet almond. I rarely use TD. The soap isn't pure snow white - but white enough.
What the others are saying is what works for me. My current recipe is lard, coconut, and high oleic sunflower. It makes a white soap without TD. Not a cold/bluish white or a chalky white, but a translucent ivory white. Very nice, at least for me.
Here's an example. The green comes from French green clay plus a dab of chromium oxide green. The coral pink color comes from pink clay. The main white portion is just the plain soap -- no TD or other white colorant added.
I used to get a nice white (but not stark white like store bought) soap without td; used lots of lard, coconut, castor and whatever high oleic oil I had on hand. Then I found Big Lots coconut oil - 12 bucks per gallon which is a great price for a hobbyist. It's food grade, but more yellow than the coconut oil I used to use so no more white soap. I have to use td now.
I love Brambleberry's white soluble td best - never need to heat the water, just plop some td into a cup, add water, swish and good to go.
I now have Nurture's td and I hate it. It's a bear to mix properly. It absolutely has to be mixed for several minutes OR you need a mini mixer, plus it should sit in solution for a few minutes or you'll end up with spots in your soap.