Te-he..!!
Reg Righyni wrote in Chapter 23 'Dry-fly Fishng': "There are several kinds of liquid preparations on the market
but not all are suitable for immediate application while actually fishing and few of the others are capable..."
Super steely shiny cock hackles would dry with a flick or two... No "genetics" in those days. Those from a 3 or 4 year old rooster were prefered.
Back to Reg: "One particularly good method is to melt a little silicone line grease on the end of the finger and stroke this onto the hackles or hair of the fly."
The Treacle Parkin is a variant on the red tag and should be tied as such replacing the red tag with a yellow or orange tag (cf John Roberts, Fly Fishing for Grayling).
Righyni certainly favoured an 'orangey yellow' tag, but I suspect this may have been for more for visibility when fishing the pattern dry than anything else:
"Let us look at a few examples of the exploitation of the fancy fly principle. Frequently the floating artificial moves from a brightly shining surface int the shade of a tree. The dark fly that could be seen well against the light background can be easily lost when it enters a very dull area.
But with the Treacle Parkin, for instance the darkish brown of the hackle and the greeny bronze glow of the body show up well where the surface is bright, while the glow of the tag can be easily detected against the dark background."
From A Case for Fancy Flies, The Creel, date not known. Reprinted in Fishing Reflections - Thoughts on Salmon, Trout and Grayling Fishing, Reg Righyni, Edited by John Winter.
I first discovered Righyni in the dusty recesses of the central library in mucky old St Helens. He's partly responisible (together with climbing and Rugby League) for me living where I do now. I'm now able to fish the waters he fished, with people who knew him. I do suspect that if modern materials were availble to him the TP may well have had a fluorescent tag!
Righyni's favourite grayling flies were the Sturdy's Fancy and Bradshaw's Fancy. Being a philistine, my favourite is a heavily weighted bug od indeterminate parentage!
Some of these patterns are popular on the Dee and upper Severn in Wales. Brought over by Yorkshire anglers. John Storey was another on Righyni's list.
Moc Morgan lists most of the dressings, he also lists the yellow tag alternative as, in Wales, can 'Coch-y-Bonddu' or 'furnace' be substituted for a dark red hackle.
I've posted a plate on Welsh grayling patterns from his
Flies of Wales (click twice in top left corner to open in super size).
The one true Welsh innovation is the 'Severn Ke' a derivative of the Ke-He loch pattern of from the Orkneys, no grayling there, the white hackle aids visibility and the mixed orange GP tippet/red wool tag hedges any bets on which colour best brings grayling up on the day.
Anyway - I hope this is of interest.