Black coatings on Kershaw Leeks

[waynorth]

It seems there are different black coatings that were used on various Kershaw Leeks. I wonder if anyone can tell me what the different ones are, and what their qualities are
My favorite EDC by the way! Just breaking in my S30V

 

[Rat Finkenstein]

I had a Boron Carbide? coated leek at one time, and it was scratch proof- very durable.

 

[Artfully Martial]

I think they do a TiNi and DLC also.

 

[waynorth]

I assume the TiNi is titanium nitride, because I've read it somewhere but what is DLC? Please excuse the newbie questions!
Does anyone know how the various coatings compare, such as the boron carbide versus these other two?

 

[sjahn]

Coating is changed from TiN to tunsten DLC.