What is the underlying biological difference between methyl green/ pyronin method and immunocytochemical method in demonstrating the presence of IgG in tissue? And these methods interchangeble. and...

What is the underlying biological difference between methyl green/ pyronin method and immunocytochemical method in demonstrating the presence of IgG in tissue
What is the underlying biological difference between methyl green/ pyronin method and immunocytochemical method in demonstrating the presence of IgG in tissue? And these methods interchangeble. and what would the results show for each method?
Ans. methyl green/ pyronin method is used to...