Hi everyone.
Gooboo, congratulations for your efforts. This is indeed a revolutionary historical milestone in 1/6: no less than colour fine-tuning on seamless bodies. Difficult to believe!
Regarding Rit Synthetic Dye (the very little Chemistry I know, is from my 2 last highschool years, centuries ago, so if there is any expert in the room, please bear w/ me): when I first heard of this stuff, I was dubious about the whole of it. Setting aside any environmental concerns about using yet another non-biodegradable substance in the hobby, I just couldn't wrap my mind around how the colour of what essentially is extremely fine coloured molded plastic (yeap, synthetic fibers are, in a way) could be easily changed... from the outside? With a dye? I still don't get it: how can you remove (because there is a Rit Synthetic Colour Remover too) and modify what is an inherent part of a piece of plastic? If that was even possible, why couldn't be done before? (this is supposed to be a new product, and common knowledge was for years, you can't dye synthetic fabric)
Anyways, it turns out this thing actually works, and synthetic fibers (i.e. plastic) is just like human hair: somehow the big molecules reponsible for colour (big-->they can interact with light) that are built into the fiber/hair strand can be separated from the stuff that actually makes up their physical structure, and be substituted by others. Period.
Yet, I try to understand the "how", which might explain the phenomena witnessed on this thread: whatever colour molecules that there are in the dye, I guess they break up into anions and cations when dissolved in water, and through some kind of chemical bond, they attach to the body's plastic molecules, which themselves are already bonded to other big colour molecules (the body's original colour). If many dye molecules concentrate in an area, they won't bond to plastic molecules, but to other dye molecules. This bond is weaker and with enough exposure to oxygen would allow dye evaporation (i.e. colour fading). Hence the disappearance of splotches after dyeing, and the fading of the overall dyied colour. The disappearance of dye stains on the body caused by clothing, after some time and w/o any intervention, could also be explained as weak dye-dye bonds from excess dye on the clothes that would migrate onto the silicone to form weak dye-plastic bonds created at room temperatures, as strong bonds would only form at high temperatures.
Why do splotches form?: maybe because of oversaturation of water w/ dye. Microblobs of dye might form and irregularly stain the body's surface. Fix: less dye in the mix (more iterations, more time, more patience), and more effort in dissolving the dye and keeping it solved throught an immersion.
More colour change w/ less dye?: maybe by covering the pot with a lid while keeping the body from touching the extremely hot metal bottom. Also, the less dye evaporates into the environment, the healthier (any evaporated dye might end up in your and your family's lungs).
Can endless dyeing iterations actually change the colour endlessly?: I have introduced the hypothesis of good, durable, plastic-dye bonds vs bad, vanishing, dye-dye bonds on spots oversaturated with dye. I am also hypothesizing that a piece of Phicen silicon might only accept and durably keep a certain amount of dye, of which a sizeable portion might already be there in the form of its original colour, especially if (as I suspect) dyeing only happens on the surface, or slightly beneath it. Any excess above this theoretical limit would sooner or later evaporate. With many dyeing iterations you would only make sure to have reached saturation, but beyond that, further colour change might not be possible as evaporation of weak bonds would eventually clean up any excess dye.
This colour modification method is, in spite of any eventual limitations, a game-changing discovery, and we should make TBLeague aware of it so that they consider the possibility of creating a line of colour-free bodies, ready to be dyied effectively, and an official, reliable, tried and true colour guide showing how to achieve any typical skin tone, durably and without imperfections.
Finally: this dyeing technique might be further refined so that figures with properly coloured nipples could also be possible.
Some final thoughts:
0) Pictures must be taken with the same reproducible lighting and capture conditions (same camera/settings, etc). Otherwise, comparison is impossible and conclusions can't be drawn.
1) I am fascinated by the fact ABS plastic does not change colour the same way as silicone. I guess those hands might be painted hands, and paint might be a completely different material from the
plastic underneath, hence the different results.
2) Does the dye make the body reflect light differently? Or is it the powder? Incidentally (sorry about my ignorance on this respect) why are you so quick to cover the body in powder? Do you use that powder also when you use the body, or only when in storage? I could not use a body in a custom while it is covered in powder.... :-(
SUCH A LONG POST!
I hope this contribution will somehow help to further develop this technique.
LMK guys.
Thanks,
m.