This was already done by a Dutch couple; Renske Cox & Maarten van Pel, 4x4electric.
They used a Skoda Enyaq 80, see https://4x4electric.com/
Check out the website for all info on the car, charging solar vs socket, all kind of data.

Would it hurt to find a source? The first hits for Japan:
"Black and white stands for mourning and cheerless occasions. For example, traditional garb for a funeral is black and white. Black for the loss, and white for their passing onto the heavens." https://kaliskrystals.wordpres...
"Traditionally, black has represented death, destruction, doom, fear and sorrow" - "White represents purity and cleanliness in traditional Japanese society, and is seen as a blessed color." https://classroom.synonym.com/...

I don't know if this is true, but at least more trustworthy than a random "No it's not"