Monitor audio Isophon kk8 modifications

[TDP333]

Hi,
I’m trying to establish what Monitor Audio doped these domes with. It appears to be a yellow-brown liquid, I guess most probably a type of glue, any ideas?

I’ve always liked these tweeters but certain frequencies do ring a little, to my ear anyway, so I can understand why MA decided to treat them with this coating. I’ve heard a couple of MAs with the modified tweeters and the sound is certainly a little smoother than the untreated tweeters.
I’m renovating a pair of RAM 1 speakers, I happen to have some spare KK8’s so I’d like to modify them along the same lines as MA and see if I can improve one of the few minor flaws with this otherwise impressive speaker.
First pic standard KK8
Second pic MA modified KK8
Last pic the Ram1

 

[turboyam]

Is that stuff sticky?, im thinking nail polish...

 

[Nat]

The gold I've seen isn't transparent. Not sure why gold would be useful anyway - dense and soft. Yes, I know that gold foil is light enough that wafting air over it can loft it toward the thing being gilded, but what would that added mass (small as it may be) actually add?
Or maybe you guys are all joking?

 

[Nat]

Wouldn't weight actually increase Q?
And the transparent comment had to do with the different color around the outer edge of the cone - it looks like a thicker layer.

 

[Nat]

I assumed they were the regular and the doped/coated version, but what do I know?