Okay , I went through my little book Pamor Eksotik Tosan Aji; the closest picture to the pamor shown on the 'keris' seems to be a variation on Unthuk Banyu "Water Bubbles" ; here is a more traditional representation of Unthuk Banyu.
According to Tammens who calls it 'foam bubbles' .
Its qualities are positive ; it is considered rare but it is not select and can be owned by anyone .
I await correction .
Hi Dave, I see you posted while I was doing the same .
Here is Pamor Eksotik's illustration of Lar Gangsir (not too helpful)