Thanks Doug, and other folks for your posts. Looks like the largest practicable waterproof container of dye is the way to go. I shall check out Pains Wessex, thanks Doug. And I shall inquire as to what our military have found to be best. Their requirements may differ from the most suitable for civilian use, except where dye is carried as personal kit. There is a strong view among the seakayaking fraternity here that flares and smoke are only really useful once your rescuers, who are usually airborne, have spotted you! Not the other way round!<br>By the way, I already carry a See-Rescue strip, as recommended by Doug, attached to my PFD always. They have proven effective in spotting from aircraft, which is where most primary rescue resources are deployed these days, at least down our way. <br>Cheers, PeterR