I'm not entirely sure it is a period piece. Its set in a mythical world so it wouldn't need to be historically accurate to our world. There are actually a lot of animal dyes. One of the most common reds is made of crushed bugs which is probably why that guy was so iffy about red.
Ik, what I said was 'most', no matter how you look at it, the amount of plant dyes is bigger than animal dyes, there is a lot of color variety in plant dyes, a very shallow ggl search will give some info, but they never actually do any research and just go by their guesses, and I never called it a period piece, I said it's about historical clothing because it is, as she strives to be a seamstress and clothing designer, with all her aspirations for her creations being historical western dresses, that she herself wears, if it wasn't about clothing I wouldn't really mind either way, but as it is about exactly that, it really expels you from the plot when they make things that are so wrong, and when they couple it with the whole, modern thinking is superior to history, which is very common in, modern person ends up in historical adjacent world, sort of story. If it's focusing on textile arts, and western historical dress for most of the characters, than there really should be research done about it.
It's really nice like, concept vise and an interesting spin on the trope, but I am always disappointed by the lack of research in textile arts and historical clothing, when the story is all about it. Like the mage mentioning how ''it must be a plant dye'' likeee, almost all of them are???? Natural dyes have a lot of color and shade variety and most are plant baseddddddd. Then the clothing having no thought given to how the under layers will look, I meeaannnn just putting her in a modern babydoll -this is how it's said in my lang not really sure for eng- or the whole, no knowledge of colors as they fit a person's look, just no, sure they did not use modern terms but making it out to be basically zero know how about how to choose colors....when clothes are one of the most important things back then... other than that I love it, it's cute, kids are shown to be able to change, tbo OG dad is to blame for the situation of MC in that timeline.