Color userinterface needs a hint for adjusting custom color #49259

Description

In my work as trainer for WordPress newbees I have a regular problem: It is NOT obvious for all users, that a click on the color preview field opens the selector for custom color.

A simple hint above the field could resolve this problem, e.g. "Preview of selected color - Click for custom color"

Step-by-step reproduction instructions

1. Add a simple paragraph block
2. Click in the Settings - Sidebar on Color - Background
3. You can see a chess-board pattern and obviously selectable predefined color circles. But no hint how to get custom colors.

Screenshots, screen recording, code snippet

Environment info

WP 6.1.1 (with and without Gutenberg 15.3.1) + WP 6.2 RC 3

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes