The existence of other stars changing in brightness gave credence to the idea that some may change in color too; Sir John Herschel noted this in 1839, possibly influenced by witnessing Eta Carinae two years earlier.[68] Thomas Jefferson Jackson See resurrected discussion on red Sirius with the publication of several papers in 1892, and a final summary in 1926.[69] He cited not only Ptolemy but also the poet Aratus, the orator Cicero, and general Germanicus as coloring the star red, though acknowledging that none of the latter three authors were astronomers, the last two merely translating Aratus' poemPhaenomena.[70] Seneca, too, had described Sirius as being of a deeper red color than Mars.[71] However, not all ancient observers saw Sirius as red. The 1st century AD poetMarcus Manilius described it as "sea-blue", as did the 4th century Avienus.[72] It is the standard star for the color white in ancient China, and multiple records from the 2nd century BC up to the 7th century AD all describe Sirius as white in hue.[73][74]