A few more โdirty detailsโ on my
โDroughtโ entry.
First, well, the colours. As beautiful morning light is, it's a pain to shoot reliable photos within it, particularly when natural colourants have a finger in the pie. I've done my best, but the quick snapshot below is still closer to the original than my submission picture.
Just how much glycerin rivers I actually got, I can't say. In any case, there is a lot of things going on with the surface relief, best seen in grazing incidence lighting:
Only in the last ombrรฉ layer, the translucent gelling-and-contraction effect is obvious; but even then by far not as impressive as I hoped for (and others like
@KiwiMoose regularly succeed with). I have laid out the brown part for, on average, 29% lye concentration โ so the darker layers are even below this! Plus the extra glycerol (5%TOW on average), which I seem to need to get anywhere near visible rivers.
I had pre-mixed the
TD (0.5%TOW on average) as thoroughly as I could, with a bit of glycerol water and a palette knife. Still those white bumps in the lower layers? Must be glycerin rivers. The bumps in the blue layer? No TD at all, and with lengthy water-bath CPOP at 60ยฐC initial temperature, stearic spots are out of question.
The rationale to choose caramel colouring (E150c) is that it is not a pigment, but a dye (water soluble) and
might distribute more evenly within the โneat soapโ rivers, than being contracted into the craquelรฉe islands. Since none of these dry-crack islands appeared, it's hard to tell if this actually worked
. In any case, an important observation is that undiluted E150c caramel does not dissolve well in soap batter, but โclumpsโ to form tiny black grains that rather resemble vanilla granules than give an even stain of the batter. Much easier to work with in dilution (I used 5% in water).
I'm quite happy with the recipe so far (15% mango butter + 10% canola โwaxโ as hard oils). Kept the oils warm & clear in the CPOP oven. Though I'm not confident yet to work with it as low as room temperature, it gave me enough time to mess around with the ombrรฉ (it'd been better if I hadn't shaken up the โblueโ squeeze bottle in advance, the batter was already at thick trace by then). A previous test batch even gave off remarkably abundant and fluffy lather, just a few days into cure, without CO/lauric oils. (I hate to be the one to remind palm skeptics that coconut palms are palm trees as well)
I'm planning to give a more detailed write-up of the indigo process in the
vat dye thread, but I'll give updates here as well, in case something notable happens to the bars.