De colore mediorum gene∣ratione. cap. 5.
BEtwéene whitenes and blacknes are many meane degrées following the mastrie of qualyties that be actiue and passiue, working and suffering, as they be more strong or féeble, and that in ma∣ny degrées: for the more mastrie drines hath, with the more difficultie it is made subtill, thin and bright, and the harder it is to make it clere, and to take white co∣lour: for a dry thing is sadde and thicke. Page 388 The lesse mastrye drynesse hath, and the more mastry ye heat hath, ye better it ta∣keth white colour and the sooner. Also the more drinesse there is, and the stronger heat, ye more blacke colour is bred. And cōmeth of fatnesse of the parts, & of great dimnesse, and of priuation of cléernesse, & of superfluitie of fatnesse of ye cléere mat∣ter, & so it fareth of moist matter: for the more mastry of moist matter yt is pro∣portionall to burning, so that heate hath the mastry, the more smoake there is & dimnesse and blacknesse: and the more the mastry of moisture is, so yt the ma∣stry of colde increase proportionallye, so whitenesse increaseth: and if moysture hath great mastrye, and heate but lyttle mastry, then blacke coulour shall abate. Also if moisture hath great mastry, and drynesse and heate lyttle mastrye • then whitenesse shall abate. And if moysture hath some mastry, & heat hath more ma∣stry, then may great blacknesse be gende∣red. But sometime heat gendreth white∣nesse in moist matter, as it fareth in the white of an egge, yt is sod: and sometime heat worketh in gréene wood & moyst, & leaueth white ashes after all ye burning, but ye colour is not very whitenesse: For alway there is a token of euill termined matter, as it wer the ouermost of a cléere christall, & that is knowen, if the ashes be separate & departed, though this cléer∣nesse stretch not into all ye body in actual cléernesse & compleat, & so it is not verie whitenesse. And so ye whitenesse leaueth therfore féeblenesse of heat yt doth work, so that kinde colde hath mastry within. Also some white egge is sod, and is not touched with fire, but a shell or a vessell is betwéene, for if no vessel be betwéene, then shoulde blacknes be gendered in the matter. Also heat working in moist matter, gendereth first blacknesse, and smoake. Also mastry of moisture gende∣reth drinesse in matter yt it worketh in. And so drines that it gendreth therein, maketh a new chaunging, and gendreth a new coulour in making the dry matter subtill and thin. And heate gathereth to∣gether things of one name & one kinde, and maketh therfore thicke and sad, and dimme: yet drie matter hath some pro∣pertye, by the which hée may make some matter stretch and spread, though it ga∣ther & drawe togethers in the beginning because of mastry, yet after ye gathering it maketh the matter yt is gendered sub∣till and thin, if the matter be dry or sta∣ble pight, & that is séene: For sometime drynesse worketh in moist matter, & put∣teth or draweth out the moisture. But cold is not ordeined to make matter that is subtill and thinne, for colde standeth in déede of making thicke, as in princi∣pall working and déede, for colde gathe∣reth both thinges of one name and kinde, and also things of diuerse names and kinde.