The target colour for the bag material is specified as a specific Pantone colour reference. The commercially acceptable light and dark tolerance for the target colour should be no greater than a Delta E of 10.0, using a
spectrophotometer to measure the colour and the CIE Delta E (2000) equation to calculate the degree of colour
difference from the target colour. However, as a visual guide, Pantone colour references have been specified for
both the light and dark tolerance limits for the target colour