Custom Colors using the classic editor

Hi, I was wondering if there was a way to save custom colors when using the visual WYSIWYG tab in the class editor. While editing content, when I click on Custom… and create a custom color, I am able to use it on the page I’m editing, no problem. However, if I move to a new page or post, the swatches are cleared. Is there a way to make sure those colors get saved? Thank you in advance. – Micah