I want to know the answer to the following question:
Which era did Cennino Cennini actively paint in?
All the background I'm provided with is that "For example, purple on a computer screen is made by a similar formula to used by Cennino Cennini in the Renaissance to make violet, but using additive colors and light instead of pigment: it is created by combining red and blue light at equal intensity on a black screen.". Is that enough to answer the question?
Answer: yes