I think I understand the Mark Carder Method of painting but I know that I haven't space to create a studio indoors. I have a sun terrace outside where I can paint. So my question is - Does creating my colour palette using a colour checker on any given day mean that on a different day all my colours on the canvas will be more or less yellow/blue due to the change in colour of the light. Is it even possible to use the Carder Method under these conditions. Does applying paint dabs to a photo also mean the colours will appear different on different days. Does the trick of testing white with a colour checker against a white sample at the subject help under these circumstances. If so how?