Since the used d-limonene has HIPS dissolved in it, I would expect it to come out of solution and "stick" to the clean ABS, thus giving the ABS a gray-ish white color. I've been using ABS and HIPS, using d-limonene to disolve out the HIPS for over 2 years now and the ABS parts show no signs of solvent attack. Also, since the work is typically for clients, I use fresh d-limonene each time forby adsinfo.com - General