| 11. | In the blotch the frass is found in the oldest part.
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| 12. | In this blotch, the frass is concentrated in the centre.
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| 13. | The frass line is green when fresh and turns brown later.
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| 14. | It is pale brown with a compact blackish central frass line.
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| 15. | There is an irregular line of frass running through the mine.
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| 16. | The frass is deposited evenly throughout the width of the mine.
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| 17. | The frass is scattered across the entire width of the mine.
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| 18. | The frass is deposited in the gallery, almost filling it.
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| 19. | The frass is initially deposited in a narrow continuous central line.
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| 20. | The frass is greenish-black and scattered within the mine.
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