The Olsson Ruby nozzle looks absolutely fine. Since it has a translucent tip, it is pretty easy to see through and it is completely clear. The inner .
Amazon.com: 3DMakerWorld Olsson Ruby Nozzle (High Output) 0.6mm – 1.75
The Olsson Ruby One nozzle for all materials. the Olsson Rubythe new High Temp. Delivers great results with standard plastics as well as with abrasive .