Abstract: A small bore plastic syringe body is disclosed with improved visual amplification of interface surfaces between a light transmissive liquid and air within the syringe bore using a solid reflective colored strip on the syringe tube and located on one side thereof. An assembly including the syringe body provides a plunger and piston received within the tube to define an expansible chamber. The strip is narrower between its side edges than the outer tube diameter, yet is of sufficient width dimension that an image of the strip, when viewed through liquid in the expansible chamber, appears brightly and as wide as the tube. Where air is present in the expansible chamber, a diffused image of the strip will appear through the tube walls that is narrower than the actual strip width dimension.