I'm building a power supply for electro-chemistry experiments. It would make more sense to have the output correctly denote which terminal is 'electro-negative' and which is 'electro-positive' instead of those colours specified for DC conventional current.
Is there a colour code specification to denote - and + in electron flow notation?
What you ask for exists in the standard red/black convention. There's no need to introduce a separate color code. The colors don't care about whether your calculations use technical or electron flow direction.
And the colors are very clear: black is the more electronegative pole. (no need to put that in quotation marks; it's fixed, established term.)
I don’t think that there is a standard colour for electron flow direction or current direction.
instead of those colours specified for DC conventional current.
These colours do not indicate anything about current, conventional or otherwise.
The red-is-positive, black-is-negative refers to the voltage of the red wire/terminal is more positive than the voltage of black wire/terminal.
This is universal and should not be messed with. It applies to power supplies and multimeters.
Power supplies generally allow electrons to flow in one direction. They leave the black terminal and enter the red terminal.
However, if the power supply is a rechargeable cell, then electrons can flow both directions depending upon the external circuit. The voltage polarity of the terminals does not change.
In circuits with reactive components and/or more than one source, the adage,”electrons flow from negative to positive” isn’t always true.
So in this sense attempting to colour code flow is impossible.
The colours of the power supply terminals indicate the voltage polarity with respect to each other, nothing more.
A time honoured, worldwide standard.
Addition:
One solution might be to reverse the positions of the terminals, in a manner that accentuates the electro-chemical usage.
