Coal tar can be injurious to health. Coal tar is also used to manufacture paints, synthetic dyes (notably tartrazine/Yellow #5), and photographic materials. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. A great many industrial chemicals were first isolated from coal tar during this time. These companies included: Side effects of coal tar products include skin irritation, sun sensitivity, allergic reactions, and skin discoloration. It is unclear if use during pregnancy is safe for the baby and use during breastfeeding is
English words of Greek origin words like "metabolize", though composed of a Greek root and a Greek suffix, are modern compounds. Greek and English share many Indo-European cognates. In some cases, the cognates can be confused with borrowings. For example, the English "mouse" is cognate with Greek μῦς /mys/ and Latin "mūs", all from an Indo-European word "*mūs"; they are not borrowings. Similarly, "acre" is cognate to Latin "ager" and Greek αγρός, but not a borrowing; on the other hand, the prefix "agro-" is a borrowing from Greek, and the prefix "agri-" a borrowing from Latin. Many are used verbatim in English texts—"et cetera" ("etc."),