I am looking for help on recommendations or guidelines regarding the utilization of "visual cues" to distinguish medications. I am working with a procedural area that is utilizing a specific type of syringe to differentiate a medication from other medications. The area is using a "control" syringe which is an IV syringe with plastic loops on it for a users fingers but it is being used to distinguish it from other IVs rather than for the need for the plastic loops. To me this is similar to relying on the color of a vial cap or color of a label rather than visualizing and verification of the label.

Are others aware of guidelines or recommendations which focus on the risk of visual cues or visual devices for medications?