Brownish-grey... A jumble of colors.
deep purple
Any dark colour. You want a colour that is bright or a colour that shows up well against black.
Lilac colour.
Milk of magnesia is a basic solution. Therefore, methyl orange shows a yellowish orange colour. Further, this indicator shows a red colour in acidic solutions.
it shows the features of different types of organic salts
A white light is shown
Violet
Brown Hair, it shows on the front cover
Dolphins are usually a grey/ blue colour. Logic shows this is due to camouflage. However it is unknown why they are this colour.
all cobalt (+ 2) salts are red but with sulphate cobalt shows pinkish red colour.....
To allow people with colour blindness or colour confusion to differentiate between the three levels of card (green triangles, yellow squares, and red circles or ovals).
maybe red because that sometimes shows danger