Page:History of the Royal Society.djvu/330

 '13. That Scowering and Washing of Stuffs to be dyed, is to be done with special Materials; as sometimes with Ox-galls, sometimes with Fullers-earth, sometimes with Soap: This latter being pernicious in some cases, where Pot-ashes will stain or alter the colour.

'14. Where great quantities of Stuffs are to be dyed together, or where they are to be done with great speed, and where the pieces are very long, broad, thick, or otherwise, they are to be differently handled, both in respect to the Vessels and Ingredients.

'15. In some Colours and Stuffs the tingent Liquor must be boyling; in other cases blood-warm; in some it may be cold.

'16. Some tingent Liquors are fitted for use by long keeping; and in some the vertue wears away by the same.

'17. Some Colours or Stuffs are best dyed by reiterated Dippings ever into the same Liquor at several distances of time; and some by continuing longer, and others lesser whiles therein.

'18. In some cases the matter of the Vessel wherein the Liquors are heated, and the Tinctures prepared, must be regarded; as the Kettles must be Pewter for Bow-dye.

'19. There is little reckoning made how much Liquor is used in proportion to the dying Drugs; the Liquor being rather adjusted to the bulk of the Stuff, as the Vessels are to the breadth of the same: The quantity of dying Drugs being proportioned to the Colour higher or lower, and to the Stuffs both; as likewise the Salts are to dying Drugs.

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