Is it normal to have nasty looking phlegm when you have a cold? phlegm is yellowish green with black stuff in it. is this normal? or something bad?

Normal : Likely clotted blood from bacterial infection . If u are getting better relax! If not collect some samples and take it to ur family doctor

Head cold: A viral upper respiratory tract infection typically lasts a week. After that a heavy cough productive of thick,discolored sputum often means that a bacterial bronchitis infection has developed and antibiotics would help to clear it up faster than letting it linger. Fever and chills raise a concern about pneumonia.