I’m laying down the law. Don’t buy white ink pads.

This postcard was published in Germany before World War I. There are probably beach towns up and down the West Coast of the United States that claim the same scene but with their name on it.
Here’s another example:

This card was published in the 1920s in the USA. The style has changed; it’s more painterly than photographic. Also, the printing is not as crisp.
I managed a related scene with an airy, all-black image.
Unfortunately, a white stamp pad will pick up every other color you use, unless you steam-clean each stamp before you use it. Trying to safeguard the precious bodily fluids of a white stamp pad gets really boring really fast. I tried it twice and gave up. A white stamp pad is about as useful as a white No. 2 pencil. (I’ve tried that, too.) Now I’m back in black.