I don't think pic that really shows anything related to OP's question.
For some reason people think that because graphene is made of carbon it must be black or very dark. It doesn't always work that way on the nano scale and solutions can be made clear despite having lots of ingredients because those molecules interact with each other to affect the absorption spectrum and that can cause dark materials to turn clear or vice versa. I'm no expert on nanotech but I know my way around a lab enough to know that lack of color means nothing when determining if a particular substance is in a solution.
Ok, but it still has nothing to do with the color argument that OP is asking about. This is talking about cellular responses at different concentrations.
I don't think pic that really shows anything related to OP's question.
For some reason people think that because graphene is made of carbon it must be black or very dark. It doesn't always work that way on the nano scale and solutions can be made clear despite having lots of ingredients because those molecules interact with each other to affect the absorption spectrum and that can cause dark materials to turn clear or vice versa. I'm no expert on nanotech but I know my way around a lab enough to know that lack of color means nothing when determining if a particular substance is in a solution.
Colors are very easy to manipulate with chemistry. Here's an example: https://www.youtube.com/watch?v=es1voPWXrlU
it's a screenshot from this presentation showing large and small graphene oxide aggregates with or without serum : https://www.youtube.com/watch?v=_kAevCpFNW0&t=1032s
Ok, but it still has nothing to do with the color argument that OP is asking about. This is talking about cellular responses at different concentrations.