Commercial egg cures vary in many ways in what they use. Most commercial egg cures consist of salts, sugars, presevatives, bite enhancers, dyes, etc. But they all differ in the proportions of each chem or dye that they use.
I believe color of a cured egg in it's self will change a fishermans success rate. For example if you just borax an egg you'll get a dull orangish-brown egg and without any presevatives an egg that will go bad quickly at room temperature. Chem cures work differently, when you use a commercial cure you have the opportunity to choose the color of egg you want and you also will have an egg that will last longer. Other advantages to a commercially cured egg is your egg will milk over a longer period of time so your actually covering a fishes sense of sight and smell.
Scents you add to an egg are extra things you can do on the river if the fish aren't interested in your offering, they're basically bite enhancers but sometimes they can work against you as much as another scent might work for you.
Remember, when your on the river and you see someone that is consistently producing it's apparent your watching a good fisherman that has put their time in fishing and they themselves likely understand how to use a quality egg cure or bait. But a quality cured egg will increase success even for an inexperienced fisherman. An important thing to remember your only as good as your bait if your baitfishing...
Hope this is simple enough to help.
Keith

[ 11-27-2001: Message edited by: stlhdr1 ]