RM 4501 Antimony Oxide
RM 4502 Chrominium Oxide
A 'fast' colorant, meaning can produce strong green colours under all furnace conditions, slow or fast, reducing or oxidizing.
RM 4503 Cobalt Carbonate
A pinkish tan powder. It is a strong colorant and almost always produces blue in glazes.
RM 4504 Cobalt Oxide
It is a metallic colouring oxide that produces blue in glazes at all temperatures.
RM 4505 Copper Carbonate
Copper carbonate is green powder and a useful source of copper oxide for staining bodies and glazes.
RM 4506 Copper Oxide
The oxide form of copper can give a speckled colour in glazes whereas the carbonate form will give a more uniform effect.
RM 4507 Iron Chromate
A dense compound of iron and chromium. It is used in glazes to produce grey, brown, or black depending on the base glaze and percentage and other colouring oxides present. Often used in underglazes, engobes and clay bodies.
RM 4508 Black Iron Oxide
Black iron is used as a colorant for a wide range of non-ceramic products.
RM 4510 Red Iron Oxide
Red iron oxide (Fe2O3, Iron Sesquioxide) is the most common colorant in ceramics.
RM 4509 Iron Oxide Spangles
RM 4511 Iron Oxide Synthetic
RM 4512 Iron Oxide Yellow
RM 4514 Manganese Carbonate
In leaded glazes manganese carbonate can produce purple tinged with brown. In an alkaline glaze, manganese carbonate can
produce blue-purple and plum colours.
RM 4515 Manganese Dioxide
When added to terra cotta bodies in amounts around 5% manganese dioxide will produce dark grey to black firing bodies.
Large amounts of manganese can produce metallic effects in a glaze. However, these glazes must not be used on food surfaces.
RM 4517 Nickel Oxide
A powerful and refractory colorant that produces greys, blues, and yellows. It can also soften and mute more intense colorants
such as copper and cobalt.
RM 3467 Tin Oxide
The most reliable, oldest and most widely used opacifier. Produces a somewhat ‘softer’ white and is less refractory (neutral)
than zircon. 5-10% usually added for opacification.
RM 3468 Titanium Dioxide
A cream white opacifier often used as a constituent of vellum white glazes.
RM 4518 Vanadium Pentoxide
A colouring agent that produces yellows, especially when in combination with tin oxide. It is also a strong flux.
RM 3474 Zinc Oxide
The source of zinc and, in small amounts, useful as a flux in middle and high temperature glazes imparting a wider firing range and good craze resistance. Above 10% produces a matt texture under slow cooling conditions.
RM 3477 Zirconium Silicate
Zirconium silicate or zircon powder is very refractory and acts as an opacifier in glazes for this reason. It is thus most effective at low temperatures.
