How to assing .mtl file color

Hi,

I have would like to assign a spesific photolux color (adv-steel) for my .mtl file but the color won't show up in the model.

Here is the file that I'm trying to use

ND_RelParSet_K01 = {

Name = BFACJ

PARAMETERS =
{
  Name = PTC_MATERIAL_DESCRIPTION
  Type = String
  Default = 'BFACJ'
  Access = Full
},
{
  Name = TEMPERATURE
  Type = Real
  Default = 0.000000e+00 C
  Access = Full
},
{
  Name = PTC_INITIAL_BEND_Y_FACTOR
  Type = Real
  Default = 5.000000e-01
  Access = Full
},
{
  Name = PTC_BEND_TABLE
  Type = String
  Default = ''
  Access = Full
},
{
  Name = PTC_MATERIAL_TYPE
  Type = Integer
  Default = 9
  Access = Locked
},
{
  Name = PTC_FAILURE_CRITERION_TYPE
  Type = String
  Default = 'NONE'
  Access = Locked
},
{
  Name = PTC_FATIGUE_TYPE
  Type = String
  Default = 'NONE'
  Access = Locked
},
{
  Name = PTC_MATERIAL_SUB_TYPE
  Type = String
  Default = 'LINEAR'
  Access = Locked
},
{
  Name = PTC_MASS_DENSITY
  Type = Real
  Default = 0.285 lb/in^3
  Access = Full
},
{
  Name = PTC_POISSON_RATIO
  Type = Real
  Default = 3.300000e-01
  Access = Full
},
{
  Name = PTC_YOUNG_MODULUS
  Type = Real
  Default = 1.010000e+07 psi
  Access = Full
},
{
  Name = PTC_THERMAL_EXPANSION_COEF
  Type = Real
  Default = 1.310000e-05 /F
  Access = Full
},
{
  Name = PTC_DEFAULT_APPEARANCE
  Type = String
  Default = 'adv-steel'
  Access = Full
},
{
  Name = PTC_APPEARANCE_1
  Type = String
  Default = 'adv-steel'
  Access = Full
}

}