Okay mony here is what my Mum did:
-put 4 quarts of rosehips in a pot (the rosehips must go through 2 killing frosts before picking.)
-add 1 quart of water to pot.
-add 2 TBSP. fresh lemon juice to pot.
* mash and boil hips until soft and mushy/ pour into a pillow case to strain/bring hip juice to a boil and immediately pour into small canning jars and can in canner.
That is the recipe verbatim from Mum's recipe, your can buy proper jelly straining bags today if you don't want to use a pillow case. I don't know where Mum got her little jars from but I see Superstore sells canning jars that look like they hold about 3/4 cups
Mum used to put this in a lotion that she bought, I hope this helps you. Oh, by the way the rose hip liquid was always a light pink colour in the jars so I don't think it had oxidized and she also gave this to my sister and I if we got a cold!