At 0:16: So even today core-formed glass is made with dung?

No! I finally found an answer. At this website (http://www.arrowsprings.com/html/making_glass_core_vessels.html) it describes a process using steel wool and a "mandrel release" compound. No dung required.

Wonder where they found the artifacts?

One way to make a modern core is to wind steel wool around a thin metal rod - also called a mandrel. The shaped steel wool is then dipped into a clay slip - (watered down clay like material.) When it dries it can then be wrapped in molten glass.

Main content

Course: The J. Paul Getty Museum > Unit 2

Lesson 1: Ancient glassmaking

Glassmaking technique: core-formed glass

Name: Glassmaking technique: core-formed glass
Uploaded: 2013-10-28T17:45:57Z
Description: Core-formed glass is one of the earliest glassmaking techniques. Watch a glassmaker shape a vessel, add colored trails, handles, and a rim (footage from the Corning Museum of Glass).

Google Classroom

Core-formed glass is one of the earliest glassmaking techniques. Watch a glassmaker shape a vessel, add colored trails, handles, and a rim (footage from the Corning Museum of Glass). Created by Getty Museum.

Want to join the conversation?

Sort by:

SteveSargentJr
Posted 10 years ago. Direct link to SteveSargentJr's post “At 0:16: So even today co...”
At
0:16
: So even today core-formed glass is made with dung?
Button navigates to signup pageComment on SteveSargentJr's post “At 0:16: So even today co...”
(11 votes)
Answer
- Marie
  Posted 10 years ago. Direct link to Marie's post “No! I finally found an an...”
  No! I finally found an answer. At this website (http://www.arrowsprings.com/html/making_glass_core_vessels.html) it describes a process using steel wool and a "mandrel release" compound. No dung required.
  Comment on Marie's post “No! I finally found an an...”
  (5 votes)
TJudd
Posted 10 years ago. Direct link to TJudd's post “Wonder where they found t...”
Wonder where they found the artifacts?
Button navigates to signup pageButton navigates to signup page
(3 votes)
Answer
- Nancy Starner
  Posted 10 years ago. Direct link to Nancy Starner's post “One way to make a modern ...”
  One way to make a modern core is to wind steel wool around a thin metal rod - also called a mandrel. The shaped steel wool is then dipped into a clay slip - (watered down clay like material.) When it dries it can then be wrapped in molten glass.
  Button navigates to signup page
  (3 votes)
Light Runner
Posted 9 years ago. Direct link to Light Runner's post “Can you reheat the glass ...”
Can you reheat the glass as many times as you want?
Button navigates to signup pageButton navigates to signup page
(3 votes)
Answer
marge
Posted 9 years ago. Direct link to marge 's post “At 1:43 it says that afte...”
At
1:43
it says that after cooling you can scrape out the dung mixture, but if it was cool couldn't you just rinse the glass, getting the dung mixture out that way?
Button navigates to signup pageButton navigates to signup page
(2 votes)
Answer
Inger Hohler
Posted 9 years ago. Direct link to Inger Hohler's post “I recognize the music at ...”
I recognize the music at
0:50
as ancient Greek, but I have not heard the rest of the pieces performed. Are they too fragments from the same age, and who is playing?
Button navigates to signup pageButton navigates to signup page
(0 votes)
Answer
Light Runner
Posted 9 years ago. Direct link to Light Runner's post “How do you take out the c...”
How do you take out the core?
Button navigates to signup pageButton navigates to signup page
(0 votes)
Answer
- Karlar
  Posted 9 years ago. Direct link to Karlar's post “The video showed that the...”
  The video showed that they knocked it out. :)
  Button navigates to signup page
  (1 vote)

Video transcript

(music) Voiceover: The earliest glass vessels are core formed. Created by gathering molten glass around a solid core. To make the core a mixture of dung, clay, sand and water is kneaded together to the consistency of bread dough. This is formed in the shape of the inside of the object to be made. Then attached to one end of a metal rod. (music) After drying, the core is given it's final shape by trimming and filing. Anklets of glass are melted in a crucible within a furnace. The core is coated with the molten glass. Turning the rod ensures an even coating. Decorative threads of different colored glasses are added by trailing. After reheating the glass, the threads are combed or raked. with a pointed tool. (music) Pincers are used to form the neck and the rim. Suspension loops are made by adding a small bit of glass to the side of the vessel. Then manipulating it again with the pincers. (music) After completion of the glassworking, the rod is removed by giving it a sharp blow. Once the vessel has been cooled slowly, the core material can be scraped out, leaving behind the vessel cavity. (music)