Pearl-White or Pearl White?

Yes. I would.

Would you also hyphenate 'Royal Blue' in the sentence below?

'He wore a red and royal blue checked shirt.'

I"d say it's optional there. You won't be confused into thinking it's a "royal shirt that is blue" but that it's the color "royal bue."

And no, don't try to write "red-and-royal-blue shirt" -- it will look silly.

Use the hyphens to bring clarity.

BarbaraPAI"d say it's optional there. You won't be confused into thinking it's a "royal shirt that is blue" but that it's the color "royal bue."And no, don't try to write "red-and-royal-blue shirt" -- it will look silly.Use the hyphens to bring clarity.

Would you agree with 'pearl-white'?

If I didn't agree, I would have said so.

I would perhaps have said "pearly white" instead of "pearl-white" but the original is fine.

You may be interested to know that teeth are sometimes referred as "pearly whites." Give me a big smile for the camera and let me see those pearly whites.

Hi Barbara,

What if I were saying, 'the sunbeams bounced off the pure white hospital walls.'

Would you hyphenate 'pure white'? I'm not sure if that would look right.

No hyphen in that one.