Technically, the inverse of Yellow is purple/violet, but blue is also a good enough substitute if contract and emphasis is needed, you don't have red paint on hand, and you are not willing to use too much black color. It is color theory 101.
Not every instance of blue and yellow color combination is a subminimal message for pro-Ukraine, just like how not every instance of red and yellow color combination is subminimal message for communism.
Technically, the inverse of Yellow is purple/violet, but blue is also a good enough substitute if contract and emphasis is needed, you don't have red paint on hand, and you are not willing to use too much black color. It is color theory 101.
Not every instance of blue and yellow color combination is a subminimal message for pro-Ukraine, just like how not every instance of red and yellow color combination is subminimal message for communism.
Color Theory 101 uses the word “complement” to describe blue and violet. Usually “inverse” isn’t a term in that context.
I specifically chose “inverse” for my comment for the RGB inverse. Yellow is #ffff00, blue is #0000ff.
Graphic design pede here.
Can confirm.
You see blue and yellow together a lot because they are a “complementary contrast” pair, meaning their opposites balance them out visually.