Board Thread:General Discussion/@comment-1875854-20150221232630/@comment-2253300-20150222204053

I would say yes. Your Ghost Fire example is actually what I am talking about. I would still consider it a Katon technique, but the fact that it had more Yin changed how it worked. All of the five basic elements have Yin and Yang already. By adding one or the other you wouldn't create something entirely different, I think you would simply orient the Elemental Jutsu in question more strongly towards the properties of either Yin or Yang. It would still be Fire Release, but Fire release can have different properties and result in different jutsu based on the composition of it's chakra. You're not adding anything that wasn't already there, you're just increasing the amount of one component of the jutsu.