Black red: 15 layers on the lens surface (Hongtai code: HTM1/BR)
From the chart, we can find easily that the coating can reflect the Near Infrared light, but in the Visible Range, the coating can't reduce the Lens transmittance, keeps the visual quality.
Ideal for Grey colors and Green

Orange: 15 layers on the lens surface (Hongtai code: HTM1/OR)
The coating is similar Black red (HTM1/BR), but the coating filter the light in the Visible Range a little more than Black red, for this reason, the coating will reduce the transmittance of the base colors 2-3%, and the coating also shows the visual quality
Ideal for Brown Copper colors

Blue pink: 15layers on the lens surface (Hongtai code: HTM1/BP)
From the chart, we can find easily that the coating can reflect
the Blue light& Near Infrared light, in the Visible Range, the coating will keep the original vision. Don't reduce the lens transmittance to ensure brighter and sharper vision.
Ideal for Green &Smoke colors

Green: 12 layers on the lens surface (Hongtai code: HTM1/GR)
From the chart, we will find the coating will filter the Green Light.
Because the Green light in the Visible Range will help the wearer to confirm the original colors. But after filtered, the lens transmittance will reduce 5%, and it's not good for the wearer to judge the colors.
The coating is always used for the fashion.

Yellow: 12 layers on the lens surface (Hongtai code: HTM1/YE)
The coating is similar as Green coating, the coating will filter the yellow light, it's not good for the wearer to judge the colors too, and after coated Yellow, the base color's transmittance will reduce about 5%.
The coating is always used for the fashion too.