I'm taking an online course for SEO. The instructor states not to have text in a table the same color as the page background even if the table background is different because this will be picked up by the spiders as spamming. For example one of my websites ( Tips for Heat Treaters - Information for the Heat Treatment Industry )has a white page background but the navigation is in a table aligned to the right whith a red background and white text. I have several websites that have similar situations with text that is the same color as the page background in a table that has a different color from the page background.
Any opinions and experience with this would be appreciated.