Making and Knowing
A minimal edition of BnF Ms Fr 640 in English Translation

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Azure

Azure is more beautiful when on the painting it has soaked up some nut oil with which it has been firstly thinned without any oil of spike lavender. If you want to know whether it is dry, breathe on it and it will not shine and will seem to be very soaked up, otherwise it will shine

Soaked with oil, azure of email leaves it and comes back to its first natural state if you dip it in some water

Colors for small scale works have to be very strongly ground and to be worked with a brush point if you want your work to be very fine