I'm putting this in the ARFS section because it's pretty cool if you have an arf nobler with the sapphire blue covering...or any plane with sapphire blue monokote...or any plane you want a blue prop on.
 A buddy said you could dye thunder tiger props so I got some black RIT dye at wal mart and went for it. Cleaned the props with denatured alcohol... brought the water (enough to cover) up to 145 deg. stirred in half a packet of the BLACK dye, drop in the props...wait 30 minutes and VOILA...SAPPHIRE BLUE PROPS! I don't know if i did them agian if they would turn BLACK or not but i guess the gray and black made this blue...and it is VERY close to the exact color of the monokote. Looks kinda weird really...the prop being the same color as the plane. Some may like it some may not.
 Oh...do this dyeing before any balancing as CYA does NOt take the Dye...if you use CA to balance like I do.

yeahhhh.some smart ass at the field the field the other day said "it looks just like the box"...and I said "uh uh...mine has a blue prop"!!!
I am goint to try dyeing another one more time and see if it goes black..someone said to add salt to the water....??

I'm thinkung the same thing... about the box being mis labled. It was the old school powder in the packets, not the liquid. One way to find out...I'll try another box. Bet it was really blue dye...not black.