I got a bottle of Conway Stewart Kingsand and it seems to have mold??

Here are some pics:







The froth like thing in the bottle neck & cap is quite semi-solid and not like froth produced due to excessive shaking of ink bottle, its as solid as cream. On puffing hardly it doesn't move, on inserting a thin metal rod it goes inside but it doesn't seem to disturb it. I hadn't tried to smell it though.

I have decent amount of inks and have never experienced such. Its quite disgusting.

Do anybody know anything about it?