According to this [0] it seems to be defined as dark characters and bright backgrounds. So probably not just strictly black and white colors. [0] https://pubme

According to this [0] it seems to be defined as dark characters and bright backgrounds. So probably not just strictly black and white colors. [0] https://pubmed.ncbi.nlm.nih.gov/23654206/ https://pubmed.ncbi.nlm.nih.gov/23654206/