I've been pretty unhappy with the latest batch of Effetre transparent striking yellow I have. It is hard to strike, bubble like crazy, and strikes unevenly. Normally - some variation in the striking doesn't bother me - but that's for intense colours. Yellow needs to be punch and intense - otherwise, it's just pale amber.
Given that I'm working a single colour at a time, compatibility isn't my issue, I thought I would try some Bullseye.
The unworked rod of Bulleye 1120 is an uninspiring pale colour. But it strikes up easily and beautifully into an intense, sunny yellow. And when I say "easily" - I mean - it just does it with the heating and reheating and you don't have to think about it at all.
There was also very little of the cloudy opacity that can develop in the striking transparent colours, but, on the other hand - I'm not working them that hard.
I'd say this is a lovely yellow and a completely acceptable substitution for me.
But remember - Bullseye is 90 COE and NOT compatible with your 104 COE glasses.