The powder coating has applied correctly and is free from contamination, yet the gloss, surface finish or colour are not as expected.
Colour is a visual attribute and is often conveniently assessed qualitatively by eye under sufficient light to test the colour against the expected result (the colour 'standard'). Where a quantitative measurement is required, colour spectrophotometry is used as a tool. The light source will have a bearing on how the final colour is perceived.
Similar to 'Sheen', haziness is more correct termed the 'Definition of Image' of a coating and is a measure of the clarity of the reflection, or 'mirror-like' finish of the coating. This attribute is usually confined to gloss coatings.
A description of the smoothness of the coating. Where coatings are not totally level they develop a waviness in the coating, not dissimilar to an orange peel.
The amount of unscattered light reflected from the surface of a coating is its gloss level. An incident angle of 60 degrees is often used, although 20 and 80 degree measurements have limited use too. Gloss level is often described as a percentage, however Gloss Units (GU) is the more accurate description.
For consistency, ideally a coating's film thickness ought to be the same no matter where on the part. Where build-up occurs at the edges of a part, this is called 'Picture Framing', and on flat sheets 'Striping'.