Perhaps your life experiences have created this 'color' association.
If you do further study on the way humans think you will find that most associations are 'learned' and that includes colors.
(i.e. someone that is color-blind may not see the association of green/red as everyone else.)
If using colors helps your trading, what difference does it really make?
If it hinders your trading, then change it.
Rejoice in the Thunderstorms of Life . . .
Knowing it's not about Clouds or Wind. . .
But Learning to Dance in the Rain ! ! !
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I do the same; white for up and black for down. My reason is to keep colors at a minimum, so that any colors that are on the screen have more visual impact. Psychologically, the black and white works better for me, as both seem more neutral and helps me to not prefer one over the other. And, they also let me see those shades against a higher timeframe context, where I do use colors, without the any of the information getting lost on the screen.
In contrast, on say a 15 minute chart, I use red and green candlesticks. On those charts, the colors give me the information I am looking for, and red/green is how I learned, so it works. Same with volume analysis.
Yet another variant, on chart analysis I prefer everything to be a single color, allowing the shapes and pivots to command the attention.
Strange how something can feel right on one chart but wrong on another. Finding what speaks to you is what matters. As trivial as it sounds, having your colors right can make a difference. Charts should be clear, uncluttered, specific, and give you the information you need without putting a whole lot of thought into it. They should not require you to strain to decipher information, and should be easy on your eyes and relaxing to you.
With today's software, any color coding you can imagine is possible.
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