Section 4.6 of the TDG Regulations states that dangerous goods safety marks must be visible, legible and displayed against a background of contrasting color. Could you define contrasting color?
A contrasting background refers to the surface immediately surrounding the placard. This surface must be large enough to create, from a distance, a perception of different color immediately surrounding the placard, also producing a contrasting effect with the color of the placard. There is no prescription in the TDG Regulations as to how the contrasting color effect should be obtained, or what should be considered an effective contrast. Common sense should prevail in this matter.
