The reason I tagged this as a 'racist ad' is because in the time in which it ran, African American women were nearly always portrayed in advertising as maids -- never as dignified homemakers, teachers, nurses or any of the other female roles that were unofficially reserved for white women.
This ad, taken in the context of its day -- which I would guess is the 1940s or early 1950s -- is unmistakably portraying a Scotswoman. Although the stereotype of the cheap Scotsman isn't as widely known in the US today, going back a few decades it was an ethnic stereotype that was used freely, often making the Scots the butt of jokes.
There are other examples in advertising that capitalized on supposed Scottish frugality. The Studebaker Scotsman automobile, for example, was so named because it was a low-priced model (read more HERE). And Scotch tape got its name -- and its distinctive plaid packaging -- from the same stereotype (read more HERE).
Judging from the comment below (click COMMENTS to read it), I have to stop assuming people can read my mind and instead offer more explanation for some of my posts.
Here's why this ad would be considered racist by many people:
If you were of Chinese descent and living in 1950s America, the rare times you would see a Chinese person portrayed in the media the portrayal
would mostly likely be of a Coolie-like character. In mainstream
advertising, people of Asian descent were never portrayed as average Americans.
why this Chung King character would be considered racist. In the context of the 1950s, that little cartoon character is representative of the one-dimensional portrayal of an entire ethnic group.