would pearl white snow need a hyphen


Every English sentence begins with a capital letter and ends with a mark of punctuation. There are no exceptions, a fact I find comforting, my having to deal with a million niggling, wriggling rules all the time. Also, when you write a word as a word, you need to mark it as such. I use double quotation marks for that. In the UK, you would see single quotation marks. Chicago unaccountably wants italics, but I find that confusing. Here is your question formatted correctly:

Would "pearl white snow" need a hyphen?

The answer is "probably". It is not possible to judge a few words in isolation. I can't think of a case in which there would be no hyphen, but that does not mean that there is not such a case. It only means that I can't think of one right now. It is better if you provide a complete sentence, perhaps "The pearl-white snow dazzled him."

By the way, snow itself is the standard for whiteness, so for it to be pearl white gets you nowhere. Adjectives weaken your writing, anyhow.