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all numbers are the same. as i said,the green label has a safety glass.the purple has a dark mask. very nice picture. the blue label has a light gray mask and the picture is also outstanding. never noticed these things before i started reading this forum.all tubes check within 5% of each other.the blue label is strongest.green label also has a slight green mask.the purple is in my chromacolor2 as we speak.the best tube i have checked is the empire rebuilt tube in the e-41 bryan gave me.10s across the board.and the picture!!!!!!
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