I have only done the hot pin test on a few my cues that have white joints or butt caps and I only do it on the joint face or under the rubber bumper on the butt cap...no clear coat. If it is not ivory the pin sinks in immediatley and the mark is actually hard to see and very small...the sharp point of a small saftey pin is very small. For inlays and ferrules I look for schreger lines.