| 21. | The B�chner funnel holds the sample isolated from the suction by a layer of filter paper.
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| 22. | Every 30 seconds, filter paper or a paper towel is used to draw off the blood.
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| 23. | Copy paper or KOH-impregnated filter paper are some low cost examples of sorbents which can be used.
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| 24. | The filter paper is used only once.
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| 25. | Second, the filter paper was strong enough to hold all the coffee grounds within the sealed paper.
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| 26. | In 1936, the widely recognised cone-shaped filter paper that fit inside the tapered filter top was introduced.
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| 27. | This image shows highly absorbent filter paper coated with a super-hydrophobic paint developed at University College London.
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| 28. | Other products include artist papers for traditional painting and printing techniques and filter paper for industry and research.
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| 29. | Here a circular filter paper is taken and the sample is deposited at the center of the paper.
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| 30. | They easily pass through filter paper.
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