Is it blue or is it grey???

Somehow or rather, Bobby and I got into the discussion with the color of this mug.  I was asking him to make me a mug of milo (hot chocolate) and I told him that he could use the "blue" mug. And then, he said, no - it's "grey". Well... blue, grey, blue, grey...!!!  What do you think???

Eventually we had to pull up the mug at Ikea's website and guess what it said:  Grey-blue!!!  So we were both correct!  It was quite a good laugh :-)
Of course, Bob insisted that he is more correct though because the word "Grey" came before the "Blue".  MEH!!!