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HAving by degrees mix'd our Spirit of Blood, with as much good Spirit of Nitre as it would manifestly work on, there was, not without noise, produc'd great store of Bubbles by their mutual conflict; which being kept in a quiet place, till after the Liquors had quite ceas∣ed to work on one another, it began to appear, that notwithstanding all our care to free the Spirit of Blood from Oyl, something of Oleaginous that had been concealed in it, had
been manifested, and partly separa∣ted, by this Operation; since not on∣ly a somewhat red Colour was pro∣duced by it, but after a while the surface of the Liquor was covered with a film, such as I have often ob∣served in Saline Liquors, copiously impregnated with Antimony or other Sulphureous Bodies. And this thin Membrane had its Superficies so dis∣posed, that looking upon it with Eyes placed Conveniently in reference to it and the Light, it did to me, and other Persons, that did not at all look on it from the same place, appear adorned with vivid Colours of the Rainbow, as Red, Yellow, Blew and Green; and as I remember, in the same order that these Colours are to be seen in the Clouds.