From the Troutbeads (maker of BloodDotEggs) website:
At TroutBeads we focus on re-creating the true colors and size of the fish eggs found drifting in your local waters. We’ve also developed a large selection of attractor colors to be used for Tube Flies, trolling flies, Spin Glo rigs, and lure building.
Matching TroutBeads to the egg drifting in the rivers is the most effective egg fishing technique ever developed. It’s been a tightly guarded secret in many areas. But, all good things eventually come to light.
Fishing is a process of outwitting your prey with creations that most imitate what fish are feeding on at a specific time of year. Matching exactly what fish are looking for will magnify your fishing experience during spawns and when fish are seeking only eggs. All the eggs they see are SINGLE, drifting along the bottom of the stream one at a time–NOT in clusters. Salmon, Trout and Steelhead do not spawn in clusters. You will occasionally see two and sometimes three eggs sticking together but the vast majority are singles.