B-Greek: The Biblical Greek Forum

When did words starting with εγλ get changed to εκλ?

For instance:
Hebrews 12:3
εκλελυμενοι P13
εγλελυμενοι P46
εκλυομενοι (01, 02)

Also interesting:
1 Peter 2:4
εκγλεκτον (P72)

Apparently had changed but was copying an earlier manuscript that had εγλεκτον, I would presume.

Obviously same for εγβ and εγδ

Is there a good book that talks about the change in spelling in Greek?

Other examples:
Acts 15:13
σιγησαι (P74, 04)
σειγησαι (05)




Thanks!

There's some discussion of this in Gignac's grammar here: https://archive.org/details/gignac-a-gr ... 3/mode/2up

Thanks so much for that resource.