Hi Gil,
I bought my "stash of Higgins Inks" in 2005 from Discount Art in Conway, NH. Unused stuff is still good! :-)
They are not listed anymore, BUT, I just checked, Amazon has Higgins.
Recommendations:
Buy the Fadeproof / water proof type.
Mix it with your thinner before adding thinner to the clear. Color will darken with each additional coat.See wing tips on my Cardinal.
Pic of my red El Diablo on Walter Umlands site under "El Diablo", also on Stunt Hangar / Gallery - District 5 pg 7. Pic of my blue (mixed in clear)and white Cardinal also shown on SHangar in the pics for our area, pg 4. I believe it is District 5, will check and send info. The Cardinal has spent a few years of flying in the Florida sun and no fading is evident.
Update: Photo info. Stunt Hangar - Gallery - Search on District 5 or Roger Vizioli
Roger Vizioli