Understand the art and science behind color in glass production.

Glass coloration is vital not only for aesthetics but also for functionality—protecting against UV and reducing infrared radiation. This course explores the science of coloration and the complexities of color transitions, covering methods to manage changes, minimize defects, and maintain consistent quality. Practical insights into transition challenges help optimize processes and improve overall glass quality.

Attend if you are interested in:

  • Definition of color, colorimetry, and color spaces
  • Influence of various coloring agents on glass color
  • Principles and limits of glass decoloration
  • Impact of redox control and reduced colors
  • Color transition: calculation and limitation
  • Operational parameter changes during the color change

What you take away:

  • Be able to determine how conventional coloring agents influence the color of a glass and describe that color in different colorimetric units and spaces
  • Understand decoloration principles and limits
  • Recognize the need for redox control in colored glass manufacturing, how to check it and act on it
  • Calculate simple color transitions and which operating parameters must be monitored


Your trainers

Sjoerd Stelwagen

Sjoerd Stelwagen studied Chemical Engineering at Eindhoven University of Technology. Directly after his study he started as a Technical Specialist at the Furnace department of Ardagh Glass in Dongen, The Netherlands, where he later became Batch and Furnace Manager. He then evolved as EHS manager for the Benelux plants. With more than 16 years of practical glass making experience, he joined CelSian in 2021 to work as a project manager and trainer.

Cristian Hernadez

Cristian Hernández graduated as a Materials Engineer from the University of Antioquia, Colombia. Then he obtained a Master’s degree in Metallurgical and Materials Science at the University of Sao Paulo, Brazil. He worked for 8 years as a Glass Science engineer at OI for different plants in South America, supporting them in color changes, glass quality issues, furnace and batch house ramp-ups, raw materials standardization and implementation of new ones. He joined CelSian as a Project leader acting as a supporter and technical advisor.


Arca Iyiel

Arca Iyiel studied metallurgical and materials engineering in Ankara (Middle East Technical University) and obtained her PhD from Istanbul Technical University in 2009. She worked as furnace designer and glass properties manager for Şişecam improving, trouble-shooting or developing new glass formulations for different businesses and products (float, container, glassware, e-glass and technological glasses). She joined CelSian as laboratory manager, furnace operations and trainer in 2024.

Training costs € 1800- per participant

Price excludes tax and duties.