What if there are no color LEDs?

Honestly, nonsense! Colored LEDs They are cheaper than white ones, and setodids can be found in a radio store or in Chinese equipment.
This is how light bulbs are painted (without sandpaper, of course)))

What does the cost have to do with it??? They tell you that there may not be any of them at all!!! The method is normal and would be very suitable for inserting somewhere into the device.

Great respect to the author!

and by the way, the colors of the lights are limited, but there are no markers!

Oh, yes... I used to come across something like this... The author is great, he came up with a good idea. Now, the question arose: will they fade?

to avoid fading, try varnishing it

The author has a million!

You say white is more expensive than colored, in my store white costs
10 rubles and color 60
Rub

The article is useful and will come in handy in life.

If you don’t have markers, you can paint them with colored paste from pens. That’s how I used to paint the lights on the Christmas tree and the lights!