primary colors are red, blue, yellow. these are the three starter pigments and can't be created using any other combination of colors, hence the term primary.
A secondary colour is two primary colours mixed together on the colour wheel.
Any colour which is not red, yellow or blue is not a primary colour. In terms of light colour, any colour which is not red, green or blue is not a primary colour.
The opposite of the colour purple on a colour wheel is yellow. To figure this out you need to understand the concept of primary and secondary colours. If the colour you have is a primary colour (one of red, yellow or blue) then the opposite colour is the secondary colour resultant from mixing the two remaining primary colours. If the colour you have is a secondary (purple, green or orange) then the opposite colour is the primary not involved in the making of the secondary colour.
Mixing one primary colour with one secondary colour will result in a colour belonging to the tertiary family of colours.
No colour because Yellow is a Primary Colour
A secondary colour is two primary colours mixed together on the colour wheel.
Any colour which is not red, yellow or blue is not a primary colour. In terms of light colour, any colour which is not red, green or blue is not a primary colour.
The colour red is a primary colour. A colour which can not be produced through the mixing of other colours. In a sense, all other colours which exist are a combination of varying degree of any of the three primary colours: red, yellow and blue.
Primary
The opposite of the colour purple on a colour wheel is yellow. To figure this out you need to understand the concept of primary and secondary colours. If the colour you have is a primary colour (one of red, yellow or blue) then the opposite colour is the secondary colour resultant from mixing the two remaining primary colours. If the colour you have is a secondary (purple, green or orange) then the opposite colour is the primary not involved in the making of the secondary colour.
Blue is one of the three primary colours. The compliment to ant primary colour is the colour achieved by mixing the two remaining primary colours. In this case the complimentary colour to blue is the secondary colour orange.