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HSAB is an acronym for "hard and soft (Lewis) acids and bases".HSAB is widely used in chemistry for explaining the stability of compounds, reaction mechanisms and pathways. It assigns the terms 'hard' or 'soft', and 'acid' or 'base' to chemical species.
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Natural soft lighting from a sunrise in Temanggung Regency, Central Java, Indonesia. Hard and soft light are different types of lighting that are commonly used in photography and filmmaking. Soft light is light that tends to "wrap" around objects, projecting diffused shadows with soft edges, whereas hard light is more focused and produces ...
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Exposed to air the hard ground will harden. Some printmakers use oil/tar based asphaltum [18] or bitumen as hard ground, although often bitumen is used to protect steel plates from rust and copper plates from aging. Soft ground also comes in liquid form and is allowed to dry but it does not dry hard like hard ground and is impressionable.
Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art.The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".
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