My further experiments indicate that none of the colors in the skullcap materials matter to the render. In my current render, I set all of them, including the transparency background colour, to a very pale blonde, and the render is identical to the previous render. So the question is, where is the shadowing coming from, since the skullcap is not set to cast shadows? Why in this particular circumstance does Transparency Falloff have any effect at all, and what exactly is it picking up?

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3