Field TipOn 24-fiber groups, fibers 1-12 sit under the blue binder and 13-24 under the orange binder / black stripe.
Common MistakeReading fiber color without checking the binder on 24-fiber tubes - fiber 13 is blue fiber under the orange binder, not a second blue tube.
About this calculationUses the standard 12-color sequence for tubes and fibers. 24-fiber groups repeat the 12 colors across two binders.