thumbs.pro : smithsonianlibraries: A conversion table comparing the colors of a variety of different pH indicator dyes from Papers from the Tortugas Laboratory of the Carnegie Institution of Washington v.11 (1917).Full text available here.

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smithsonianlibraries: A conversion table comparing the colors of a variety of different pH indicator dyes from Papers from the Tortugas Laboratory of the Carnegie Institution of Washington v.11 (1917).Full text available here.

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campesine: Silly Symphony - Flowers and Trees (1932)

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atomic-chronoscaph: 1970s - photos by Stephen Shore

atomic-chronoscaph: 1970s - photos by Stephen Shore