FYI - I was at Tulane Univ a couple of weeks ago and saw in their index to their special collections the following entry.
"Roll, Co. K, 6th Regt. La. Vols., Violett Guards, water color"
I didn't know if you were aware or were interested but thought I let you know in case. I had hoped to make a copy while I was there but didn't even get to look at everything I was there for. I have no clue what the "water color" indicates. I can give you contact information if you would like.
Clay Lord
crescentregiment@comcast.net