Yellow

A colour that apparently cries out for attention.  Originally made from arsenic and cow urine, it was used in the 19th century to create emotions.  Wikipedia tells us this about yellow:

'Yellow is commonly associated with gold, sunshine, reason, optimism and pleasure, but also with envy, jealousy and betrayal'

 Largely considered cheerful, yellow has a troublesome history: Judas Iscariot's robes depicted as yellow apparently, traversing through its iteration as The Yellow Wallpaper (Perkins-Gilman 1892 reference to 'a slight hysterical tendency') yellow also became synonymous with fin-de-siecle misdemeanor  in The Yellow Book before its particularly vile association with exclusion inherent in the wearing of a yellow star.

Gold, sunshine, reason, optimism and pleasure are infinitely more appealing sensations than envy jealousy and betrayal so it is with great effort that I choose to promulgate the necessary show of positivity to shove a load of daffodils onto my post instead of what I'm actually feeling right now!

Be cheered,  it'll be a temporary outbreak of wild emotionalism.  I think...