It's a minor detail, but I just realised that the light titanium paintjob that i showed above in this page 10 days ago (#B0A89200 with frost white pearl), glows under certain light conditions, but not too much. There is no filter applied in this screenshot:
It glows because the hex is too high, it looks more like a tan color than titanium, I'd suggest darkening it quite a bit.
The problem is that with trying to approach the real color it depends so much of where I take the sample from.
In these photos, depending on where I put the cursor, the saturation can be around 15% or be above 70% or 80%. The lightness changes from 70% to more than 90%. Hue goes from 20 degrees to more than 50 degrees.
So instead I took the hex from here (not even sure if it's the same titanium paintjob), which has 44 degrees of hue, 15% saturation and 85% lightness. I reduced the lightness to 63% and obtained the color in the zentorno. It is not the color of this Aventador (although it is a good approximation to the parts where the light hits more intensely), but I liked it a lot, and stuck with it.
Anyway, since many of these modern luxury paintjobs are obtained using three or even four coats of paint where each coat has a different shade and has enough transparency to allow us to see the coats underneath, and that is why the color seems to change so much depending on the light and the angle of view. It is impossible to know the hex of each coat separately, and In gta we're constrained to just a custom base and a non-custom pearl, except if you use a metal or chrome as a base, with a custom crew color and a pearl on top..