Made with whole fruit. Made the authentic way in copper pans. Since 1938. To make our delicious blueberry & blackcurrant preserve, we use only the finest whole berries. Using traditional open copper pans, the highest quality fruit and our authentic methods, we ensure rich fruit flavours in every batch and that special home-made taste you expect from Mackays. Scan with smartphone. mackays.com. Facebook/mackays.jams. Made in Scotland.