Not at all. Most coloured salts contain transition metals or heavy p-block elements, but even the largest alkali metal ions give colourless salts. It depends on electron distribution in the ions, not how large they are. Solution Not at all. Most coloured salts contain transition metals or heavy p-block elements, but even the largest alkali metal ions give colourless salts. It depends on electron distribution in the ions, not how large they are..