Japanese snack company Calbee is temporarily switching to black and white packaging for some products. This change is due to supply instability in printing ink, linked to rising oil prices amid the Iran conflict.

Global oil prices rose further with Brent crude climbing near $110 a barrel, as a standoff over the Strait of Hormuz continues with the US and Iran both rejecting the other's ceasefire proposal.  Meanwhile, Japanese snack giant Calbee has decided to temporarily switch to black and white packaging for some of its products including crisps and prawn crackers due to supply instability in printing ink, made using petrochemical materials.