/overcoat/blue sensitive/CLS/etc..... That is the layer order making the CLS the 3rd layer (nominally). If the blue sensitive layer is multicoated then the CLS is buried even deeper.

As for the "old" stuff, you must remember that in Ives day they may have needed a 1 micron grain to get the same speed that we can get today from a 0.1 micron grain. in fact, back at that time, Chlorides were not really much more than UV sensitive curiosities, but today they can get ISo 100 on RC support with no UV..

This affects turbidity and other properties related to grain size vs speed.