Though some other plein air painters seem to be able to disprove my theory, until today I had not really managed it. The theory is this: "The abundance of light outdoors, even when standing in shadow, makes it virtually impossible to record colours seen, in a chroma which looks correct outdoors and indoors". My thinking was this. The addition of light to any colour makes it appear to be a lighter chroma than when light is subtracted (i.e. indoors). Therefore, chroma will look correct outdoors, but as soon as the same picture is viewed indoors it will appear dull. Indeed, this is the most obvious sign to the tutored eye, that a painting has been done outdoors. But why should this be? Surely it is possible to correct this somehow. By chance, I seemed to do this in my painting today. I'm not sure how I did it, but I'm going to try and figure it out, because I like brighter paintings.