James,
Yes you can, thats the original prupose of these dyes. typically they are used over metallic base coats. I have used them over pearl base coats too. One thing to note, if you use them over a solid base, it wont add much to the effect. It needs the "sparkly stuff" under it to play with the light

I read that article also, would like to try a transparent finish myself sometime.  The HOK Kandy Koncentrates,  are they actually a dye (thin).
 
I bought several pints of Brodak Candy colors some time ago.  I dont plan on using them as intended (on top of silver/gold base) after reading some of the experiences here on this forum.  I was wondering if I could do a transparent finish by using the candy color dope by themselves (no base color) after building up a substrate with cleardope and filler.   Then of course a final clear topcoat.