Cadiz 8 Cadiz Harbour Yellow-green Exceedingly thick 9 Fourteen miles Bright green Still thick, but less so 4 Off Cabreta Point Black-indigo Much less thick from Cadiz 11 Between Capes Deep Indigo Very little matter, very pure 5 Off Tarifa Undecided Thicker than No. 5 7 Twelve miles Yellow-green Thick, but less strongly diamagnetic than bismuth. If.