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You might be good just switching arrow directions (pardon the ASCII art): Read: arrow points away from the icon []-> Write: arrow points towards the icon ->[] I'm basing the suggestion on the data flow direction (when reading, data "goes out", when writing data "goes in")


Cubase (digital audio workstation) uses red for writing and green for reading automation values (it also uses 'W' and 'R') BUT you should never rely on colour for indication of status - especially if you're using red and green! As has been pointed out in the comments, your icons are not clearly defined. Make sure they're easily readable in monochrome before ...


No, there are no standard colours used for "read from" or "write to". So other than choosing icons which are clear in the first place (those that you show are not), the important part is that you are consistent in your colours if you decide that you need to have different colours in the first place.

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