The tests may also show how much light (illumination) you need to be able to distinguish objects with similar brightness or color (low contrast).

If you have reduced vision, you may need more light to be able to distinguish objects with similar brightness or color (low contrast).

The "black velvet bolete", Tylopilus alboater, is roughly similar in appearance, but is distinguished by a blacker cap with less brown color, and a velvety cap texture.

The other three prints are chromolithographs (a 19th-century term distinguishing prints with color integrated from those to which it was added by hand).

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