Some Fonts Gray Some Black

Hi Guys....I went to the Fonts folder in Win 7 and noticed that it now displays what the font looks like in the thumbnail icon. (which is nice).

However, I noticed there seems to be 2 different situations. Some of the fonts are displayed on the icon in black and some seem to be grayed out.

I also noticed most of the Grayed out ones are foreign language fonts.

Is it OK to delete these fonts or should I leave them be.

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