The visual appearance of facade glass is essential in modern architecture. Designers and building owners carefully choose the coatings which they will apply to their building to make sure that the design intent will be met. Mock ups and coating samples are often not viewed under conditions representing the final installation. Therefore it can happen that Architects and designers will be disappointed looking at the final building. The available standards and guidelines for evaluation the visual appearance of facade glass do not take this matter into account. Values provided by the standard are always perpendicular to the glass and do not represent the visual appearance of a building. Here is a way how to view the mock ups or glass samples under the right conditions and a indication that can be expected of coating suppliers who are interested to tell the truth.