Next I map the "Specular Color". We make a duplicate of the file texture "With Connections to Network". This way I only need one texture placement node. Then I connect the duplicate with the Specular Color of the shader.
Now the highlight looks a little more interesting.Next I will try some variations on the Specular color by connecting a Ramp to the "Color Remap" of the "Specular Color" file.
In the file of the "Specular Color" under Effects click the "Insert" button next to "Color Remap".
This is my final network for the tube shader, all that's left is editing the "Ramp" to get the desired look.With the help of the IPR it's easy to check out different settings. Now open the "Remap Ramp" and experiment. Below are some Testrenders with their appropriate "Ramps".