Let me add, that having made divers Tryals with that
Blew substance, which in Painters shops is call'd _Litmase_, we have
sometimes taken Pleasure to observe, that being dissolv'd in a due
proportion of fair Water, the Solution either oppos'd to the Light, or
dropp'd upon White paper, did appear of a deep Colour betwixt Crimson and
Purple; and yet that being spread very thin on the Paper and suffer'd to
dry on there, the Paper was wont to appear Stain'd of a Fine Blew. And to
satisfie my selfe, that the diversity came not from the Paper, which one
might suspect capable of inbibing the Liquor, and altering the Colour, I
made the Tryal upon a flat piece of purely White Glass'd Earth, (which I
sometimes make use of about Experiments of Colours) with an Event not
unlike the former.
And now I speak of _Litmass_, I will add, that having this very day taken a
piece of it, that I had kept by me these several years, to make Tryals
about Colours, and having let fall a few drops of the strong Infusion of it
in fair water, into a fine Crystal Glass, shap'd like an inverted Cone, and
almost full of fair Water, I had now (as formerly) the pleasure to see, and
to show others, how these few tincted drops variously dispersing themselves
through the Limpid Water, exhibited divers Colours, or varieties of Purple
and Crimson.
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