Also not Zing and still a new member, but I do have a lot of experience in this area - infusing herbs / roots / flowers / leafy bits / barks / woods - into base oils for salves, soaps, what-have-you.@Zing do you ever use colorants in your bars?
There's no reason you couldn't heat or cold infuse natural colorants like turmeric or whatever else you'd like to try into one of your lotion bar base oils. Simply strain it through a *very* fine strainer - and even a coffee filter after first running it through a sieve - before adding to your formulation to avoid any graininess / scratchiness in your finished product. Massage some into your skin before adding it to your formulation to be sure. There are some very interesting online shops selling ONLY natural colorants for the purpose of fabric & wool dying. They carry a wide variety of amazing botanicals from all over the world which can also be used for soap making, dying wood & all sorts of other stuff. Pretty cool
I actually intend on doing this myself in the near future - for lotion bars or whipped butters, which is a new way for me to use infused oils - as I use only natural colorants, no micas & no lake colorants, no titanium dioxide etc. Bought a pile of botanicals - woods / leaves / roots / flowers - which were new to me with the intent of using them in soap, but am going to experiment with them in other products as well. Just be sure to do your research on each botanical - not via the FDA / the Canadian branch as they have scant info regarding this subject. Find out if they have any traditional uses in different cultures. THEN go & check if it's a restricted ingredient. You'll learn far more this way Be sure to test it the end product on yourself as well for at least a couple of weeks & have friends AND family members do the same. That way you can tell if it truly is a 'sensitizer', as some botanicals are erroneously labeled. If 9 out of 10 people can use it without issue, or 10 out of 10, or even more, that's a pretty good indication that it will be fine to use. This is one of the reasons I hand out samples in my area to get feedback from random people before finalizing a formulation.
Good luck