|MS Ferguson 67, f. 14r.|
University of Glasgow Special Col.
Always examine the colors to get to know them by eye, as I have always done, because in this matter I cannot give specific doses. Sometimes the powder will tint more, other times less, therefore you must practice with your eyes to understand the colors.-chap. 95.
Do not presuppose that I have described a way to make something ordinary, but rather a true treasure of nature, for the delight of kind and curious spirits.-chap. 133.
…Perform this operation under a large chimney and when the fumes begin to assault you, it is best to leave the room. This smoke is most injurious and could be deadly; therefore you should see that no one inhales it in any way, because it would do very great damage. When all fumes pass, you should nevertheless leave the crucibles in a low fire, until it goes out completely. -chap. 73.
When working this glass use the same diligence that the skilled masters use and in so doing you will make material that is perfectly true to the jasper, agate and chalcedony of the orient. It will be adorned with so many graceful and beautiful areas of undulations and enhanced with the play of diverse, lively, flaming colors, that truly it will seem nature cannot attain so great a height or grand a prize. -chap. 37.
If you want to have fine crystal, then in this you must exercise great diligence; when the frit is made with careful attention, it will be white and pure like snow from heaven. -chap. 2.
As the common proverb of the art of glassmaking says: a fine sieve and dry wood bring honor to the furnace. - chap. 8.
In closing, I say that the artisan who is diligent, practical and works step by step, as I describe, will find truth in the present work. - Preface