Is there a color chart to buy so I can hold up the lego to the chart to compare
colors?
There is nothing premade, but there are a few that you can put together yourself:
Full disclosure, the first one is mine (shown in picture).
There are prepared ones, for example a search for lego periodic table will give
you one. However, BL users are better off buying parts from reliable BL sellers,
as this will be better value and they can just use colours they expect to find
and in whatever order they want.
USA, Oregon
Canada, British Columbia
United Kingdom, England