Georgia Redpath - Collage, Casting and Colour - 13th, 20th, 27th of January 2027

Join us to explore simple mould-making techniques for relief casting, alongside casting using custom-fused glass billets, which allow for controlled colour placement in the final cast with Georgia Redpath.

Georgia will demonstrate how to work with paper and cardboard, creating a series of your own small collage blocks using a range of approaches, from the clean geometric through to highly textured and even pictorial. These will then be moulded in silicone, and finally in the refractory investment plaster which shapes the glass in the kiln. Alongside this, participants will learn several approaches for creating custom fused blocks which can be used to control colour in the final casting. This offers an opportunity to delve into glass colour mixing and discover how relief casting can reveal the individual layers of glass, subtly increasing your colour palette.

Throughout the course, you will be encouraged to try out a modular approach, where smaller units come together to create larger compositions. You’ll discover the modular’s capacity for recombination, and how it allows not one but many compositions!

You can find more about Georgia here:  http://www.redpathglass.co.uk/

Equipment notes: For this masterclass you will benefit from having two additional 5mm borders for the collage stage of the process. The frames help to keep modular collage pieces together while you’re casting them in silicone. It also allows for easier coldworking. You can purchase these through Warm Glass UK HERE. If you are overseas, please contact us for the .stl files which you can send to a 3D printer near you.

Skill Level:

• Prior knowledge of glass cutting and kiln forming will be helpful, but is not essential

Course Summary:

• Work safely throughout the mould making, kiln casting and finishing processes
• Create successful relief models using collage, nested geometric shapes and modular design techniques
• Choose suitable silicone and prepare a collage model to make a reusable silicone mould.
• Understand kiln mould types and plaster mixes
• Use a silicone mould to produce a single use refractory plaster mould for firing.
• Use billet glass, fused sheet blocks and frits to control colour in relief casting
• Calculate the glass required, prepare and load the mould, and adapt firing schedules for different sizes and glass formats.
• Divest, clean, coldwork and consider display options for completed relief panels

Workshop Outcome:

• Two or three small glass relief panels - I’ll be focusing on panels which are 11 x 11 cm and 11 x 16cm. However, you can choose to create larger (or smaller) panels if you like.
• A family of modular collaged cardboard relief models (which can be used to make further silicone moulds) and / or two or three collaged relief panels.
• Silicone moulds which can be used indefinitely to make further refractory plaster moulds for casting glass