ID 466577 - Specular Tint doesn't work for black or dark colors.

Problem summary

Specular Tint doesn't work for black or dark colors.

Customer reported version
modo.n/a

Customer reported platform

n/a

Steps to reproduce

1) Open Modo and create a simple sphere.
2) Create a new material, assign it to the Sphere, and set the Color to black.
3) Select the newly created material item in the Shader Tree and inside its properties set the Shading Model to Principled.

4) Change the Specular Tint value and notice that it has no effect.

Expected behaviour
The object should become tinted.

Actual behaviour
Specular Tint doesn't have any effect on the object. 

Workaround
Unknown.

Reproduced by support

This bug has been reproduced in:

14.2v2 - Windows 10

14.2v1 - Windows 10

14.1v2 - Windows 10

14.1v1 - Windows 10

14.0v2 - Windows 10

14.0v1 - Windows 10

13.2v1 - Windows 10

13.1v1 - Windows 10

13.0v1 - Windows 10

12.2v2 - Windows 10

Earliest version tested

12.2v2 - This issue appears to be in all versions of the product.