I do not know how much this will help but the Valcan Sanyo FC Stealth Line May be worth a try. I have been using it in tapered leader construction on Floating T-Lines and the Opaqueness shows up very well under water compared to 16 Lb. RIO Steelhead/Salmon Tippet Material. In normal light it is a pale milky green. Under a Blacklight, it glows a bright, pale sky blue - which has not affected its fish catching ability for me in the least so far. In dawn/dusk lighting conditions, the opaqueness really glows. It is available in sizes, 2.5, 3.5 and 4.5, and possibly more. TBUM and DragonTail Tenkara are sources. It comes on 50m spools and is a bit pricy. Since this is Japanese made Tenkara Level Line, there are no material mixing issues with this line at all…Karl.
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