When conducting the shine test, a definite shine indicates what type of clay?

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Multiple Choice

When conducting the shine test, a definite shine indicates what type of clay?

A definite shine in the shine test signals a high degree of plasticity. When clay is highly plastic, its fine mineral grains and water content lets it stretch and form a smooth, cohesive ribbon or surface; this smooth surface reflects light, producing a glossy, shiny finish. Lean or low-plasticity clays don’t form long, smooth ribbons and tend to look dull or crack, so they don’t show that definite shine. Organic clays can vary and often don’t give a reliable shine because the organic matter disrupts the surface and cohesion.

A definite shine in the shine test signals a high degree of plasticity. When clay is highly plastic, its fine mineral grains and water content lets it stretch and form a smooth, cohesive ribbon or surface; this smooth surface reflects light, producing a glossy, shiny finish. Lean or low-plasticity clays don’t form long, smooth ribbons and tend to look dull or crack, so they don’t show that definite shine. Organic clays can vary and often don’t give a reliable shine because the organic matter disrupts the surface and cohesion.

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