Ok, I’ll try again... Un bon pour les cheveux shampooing.

Question

To me this reads as “a voucher for hair shampoo” and I don’t see how the syntax is incorrect... unless “Bon” is supposed to be an adjective and not a noun.I’m very confused!?

Answer

I guess you have to parse it differently: it is actually un bon shampooing pour les cheveux.

Answer

Ahh, I see...thanks

Answer

Hi karl, 
I cannot find the context but if it was a voucher (un bon) it would be :
Un bon pour un shampooing...
Hope this helps!

Answer

I think the point that is being taught here is that adjectives, even short adjectives like bon, are placed after the noun if they have a complement, i.e. "bon pour les cheveux". So it should be:

un shampooing bon pour les cheveux

Answer

I think it is a very odd question about adjective position since there isn’t actually an adjective as it stands and to make sense of the sentence you have to move a noun, and understand that bon is supposed to be an adjective.

Answer

Just to add -
'Un bon shampooing pour les cheveux' , indicates that the shampoo is a good quality one 
You would say - 
'Un shampooing bon pour les cheveux secs / gras/ abimés' 
for a specific shampoo good for dry, greasy or damaged hair.
Hope this helps!