A monochromatic object or image reflects colors in shades of limited colors or hues. Blended hue progressions use related hues to blend together the two end point hues. Most species are bright in color with hues of brown, black, red, or orange. Its slowly changing hues and striking colour collisions were addictive. Palettes made of a continuous color gradient from darkest to lightest arbitrary hues. Transparent gemstones occur in the "pure spectral hues" of red, orange, yellow, green, blue, violet. It appears in the background in subdued hues of the basic uniform colour. Violet, and green are the most common secondary hues found in blue sapphires. Ruby may exhibit a range of secondary hues, including orange, purple, violet, and pink. The mix of these two hues determines the visible unitary colour. Teal&colon; where it is a combination of blue/green but with grayish hues. The normal primary and secondary hues in tanzanite are blue and violet. Yellow and blue are the normal secondary hues found in emeralds. They have different brownish hues with whitish, patterned underside. At the transmitting camera, a mechanical disc filters hues (colors) from reflected studio lighting.