- Mature trichrome
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Masson's trichrome stain. Figure 3 Lung - Fibrosis in a male focus of mature subepithelial bronchial fibrosis with epithelial atrophy. Figure 7 Lung, Pleura -. The MSB technique selectively stains fresh, mature and old fibrin orange-yellow, red and blue respectively; the Masson trichrome does not distinguish between.