Gingerpedia
Evergreen field guide
Red hair through history: pigment, portraiture and persistent mythology
The colour before the colour had a content strategy.

The word ginger has long been used in British English for red hair, while museum collections preserve changing portrayals across centuries. Meanings vary by place and period. According to Merriam-Webster and National Galleries of Scotland.
Ginger can be affectionate, descriptive or insulting depending on speaker and setting. OMGinger uses it as a broad cultural banner while recognising that not everyone chooses the same label.
Portraits repeatedly made red hair a visual signal. That symbolism tells us about the culture making the image, not the character of the person wearing the hair.