JonMcD
Seems to me that it's the GEC knives that very typically take on a yellow/old ivory hue and very attractive too. But this can happen without use, I've a 38 Farmer's Jack stowed away in a knife roll that's an exceptional rich colour despite minimal handling, no light and no tasks. Whereas , a Fontenille-Pataud Laguiole of mine has been used a lot since 2014 yet shows minimal colour change, some but not much. The F-P is all stainless construction and the GEC knives either brass liner or carbon liner, can this be the key?
Can't say how CASE bone will 'mature' but it might.
This 15 has been shown a lot don't want to keep boring people with it... but I'm proud of it. We could all do with some more Ivory smooth bone from GEC that's a fact. I'd like to see jigged Ivory bone from them or Ivory that's been scratted in some way, a nice possibility.