Son aconsejables las juntas de "negro de humo" para la combinación con materiales pulidos?

No. Este tipo de juntas posee en su formulación carbón micronizado, difícilmente atacable, el cual penetra en los microporos superficiales de las baldosas de porcelánico pulido y es muy difícil de eliminar.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.