This is a short post because I wanted to share some color facts in Gimkit.
By now, we all already know that changing the color of a prop is just adding a plain-colored multiply blend mode layer on top of it. In the past, this caused issues as people would think they were only affecting the main color of the prop, though when a conflicting color was selected, there would be confusion on why the prop was not that color. However, the multiply blending mode still has many useful features (alongside it being the most popular color-picking mode.)
In some rare cases, the color selector WILL work accurately on all colors – this is when the prop is white. For example, this can be seen in marble signs.
Darkening props is great in this blending mode because for any prop, changing the color from white to grey will always result in a lower value; you can even add a cool-colored tint to the prop for a shaded effect.
For an area with nice lighting, know your color theory as it will help some props stand out while others may lose detail from the darkness and become more obscure. If I made all the props in an area red, it would detract from the cool-colored props like the blues and purples. Shifting hues sacrifice (sometimes) saturation and always value. Coloring a prop around the same color as itself will increase its saturation, while in opposite hues, the saturation will decrease. You will usually want to tint your props similarly depending on what looks best or to signify some emotion or thought. To show props in an afternoon setting, I would color in a mostly orange and yellow tone.
The most neutral-colored objects will usually tell the tone. For reference, if the colors are not consistent, it may look tacky as shown.
However, the contrast may sometimes be good, depending on your palette. The blue on the book here compliments the red and orange surrounding leaves, and though the background is warm, the book is cool which contrasts it, giving it more importance.
One last note is that not all colors are achievable for some props due to this mode, and you may realize while messing with colors that there is a pattern where you will be able to result in darker colored props more often than brighter props (e.g. you cannot turn a wooden table white.) You can check which resulting colors are possible and which color to use on a prop to result in such a color. In the image below, I made more monochromatic props (as they work better) grey as a test of the formula since the RGB value for grey is (n, n, n) where n is an integer between 0 and 255, meaning I could easily change the grey by lowering each channel value if it was not working whereas saturation could potentially be a problem.
Calculations
Multiply is called multiply because you multiply. “Result” will be the color we want, “base” is the color we already have, and “multiplier” is the color we put on the prop to make the result. My result will be (81, 81, 81) since I want the cactus to be dark grey.
Result = Base * Multiplier
Since we want to find the Multiplier, rearrange it to get
Multiplier = Result/Base
First, find the predominant color of the prop – for this cactus, 
, I will select the unshaded green since it takes up a majority of all the colors. It’s RGB is (87, 135, 81). Use the formula for each corresponding channel.
Multiplier = (81/87, 81/135, 81/81), about (0.931, 0.6, 1).
If any numbers are greater than 1, then there is no multiplier to reach your resulting color and you have to try again with a darker color. Then, multiply by 255 to get the multiplier color code, which in my case is (0.931255, 0.6255, 1*255) = (237, 153, 255). Color a prop with your calculations, and it will be your desired color; the grey cactus is seen in the image.
You can also just guess and check. This is just to showcase how each prop in the image turned grey, but it may not always look great sometimes due to highlights or multiple colors in the prop. Colored props to turn grey can also be used elsewhere in a non-monotonous area, like whenever a grey and red cactus plant is needed somewhere? Anyway, thank you for reading.
