OpenGL - Restoring material properties

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OpenGL

In OpenGL with C#, I am setting ambient and diffuse material properties for a complied glList containing triangles in Windows Paint event.

Typically I use,

void Control_Paint(object sender, PaintEventArgs e)
{
....
float[] CustomColor = { 0.5f, 0.0f, 0.5f, 0.8f };
if(UserInputColor == true)
 gl.Materialfv(gl.FRONT_AND_BACK, gl.AMBIENT_AND_DIFFUSE, CustomColor);
gl.CallList(listId);
....
....
}

In the first call UserInputColor value is true.
In the subsequent calls of the Paint event UserInputColor value could be false.

I see that the material properties are retaining the previously set values in subsequent paint events.

In my case, I want to retain only the gl.FRONT & gl.AMBIENT settings at the end of Paint event. Retaining these values would make me to optimize on unnecessary setting of properties in every Paint event.

I do not want gl.BACK & gl.DIFFUSEto be retained if the UserInputColor variable is false. So I want to clear them off at the end of the event.

Is there a way to restore specific material properties after the execution of a compiled glList through any OpenGL command?