Blue is one of three primary colours in painting.
I wasn't aware of that.  What are the other two primary colors?  I'm guessing yellow is one?
No it isnt, blue is just one of three colours, Red and Green are the others
I'm not a painter, never have been very artistic.  In fact, I had never thought about painting having primary colors.  I guess you can make a lot of different colors by combining those three in different variations.
I guess you could say that. Bet you didnt know that the eye perceives blue when observing light and its dominant wavelength being approximatley 450 and 495 nanometers?
I did not know that either.  That is a huge piece of knowledge to just carry around in your brain all the time!!
Fluorescent lamp
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light. An electric current in the gas excites mercury vapor, which produces short-wave ultraviolet light that then causes a phosphor coating on the inside of the lamp to glow. A fluorescent lamp converts electrical energy into useful light much more efficiently than incandescent lamps. The typical luminous efficacy of fluorescent lighting systems is 50–100 lumens per watt, several times the efficacy of incandescent bulbs
He included indigo, the hue between blue and violet, as one of the separate colours, though today it is usually considered a hue of blue.
In painting and traditional colour theory, blue is one of the three primary colours of pigments (red, yellow, blue), which can be mixed to form a wide gamut of colours. Red and blue mixed together form violet, blue and yellow together form green. Mixing all three primary colours together produces a dark grey. From the Renaissance onwards, painters used