9423
Like BBC1 , the ITV network was officially broadcast in black and white at this point ( though programmes were actually broadcast in colour as early as July that year for colour transmission testing and adjustment ) so the episode was seen by most in black and white .
 BBC1, ITV
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 BBC1, ITV