کلماتور
A floating mass formed in pools by the entangled filaments of a European fresh-water alga (Cladophora crispata).
A white or yellowish white crystalline substance, C20H14O4, formed by condensation of the anhydride of phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids. This reaction, being very delicate, is used as an indicator.