This may be a bit premature to market, but here's an item for anyone who is a LaFountaine nut, and likes tying and fishing ESP's and DSP's.
In Gary's book he recommends Dazzle and Dazzleaire as a yarn having the clear trilobal filaments in it. Vintage skeins are still out there, but it's hard to find the colors listed in Gary's pattern by pattern descriptions. (A side note: I have NEVER EVER seen a vintage yarn with the word Antron anywhere on the label. Thus I procured a yarn Gary recommended that is still out there on Ebay.)
So I went to work and over the last several years found on EBAY, the colors listed for the top patterns in Gary's Caddisflies in vintage Dazzle and Dazzleaire yarn.
I now have 70 cards with 10 colors spooled on each. You can tie all of the patterns in Caddisflies with this recommended yarn. You can see the clear trilobal (here Creslan 50-60%) filaments mixed in with the colored nylon (40%) filaments. The stuff really does sparkle. It's different than mono-color sparkle yarns/ "antron" yarns out there today. It is a combination of colored and "clear" filaments.
I'll post more pictures if you are interested, to authenticate the materials.
I'm definitely not here to argue the "original" antron used by Gary. I won't say anything else other than I found one of the yarns he recommended in all the colors necessary.
Maybe you're interested in a full card of 10 colors.