[Natas Setiabudhi]

Hi everybody
I just wonder what are the differences between titan oxide and rutile iin clay body and glazes? The effect, the amount, the character, etc. I really appreciate for replying.

[neilestrick]

Generally, Titatium Dioxide would be used as an opacifier, but doesn't work as well as Tin or Zircon-based opacifiers. Rutile is typically used as a colorant, for buttery yellow colors in oxidation, and sometimes grey in reduction. The greatest benefit of both is that they tend to grow crystals in glazes, which is a good way to create matteness, or just add interest to an otherwise boring glaze.

[Natas Setiabudhi]

neilestrick, on 11 February 2012 - 11:57 PM, said:

Generally, Titatium Dioxide would be used as an opacifier, but doesn't work as well as Tin or Zircon-based opacifiers. Rutile is typically used as a colorant, for buttery yellow colors in oxidation, and sometimes grey in reduction. The greatest benefit of both is that they tend to grow crystals in glazes, which is a good way to create matteness, or just add interest to an otherwise boring glaze.

Thank for replying. How about the amount for both in glaze mixture? Because when I used rutile 15%, the glazed became pinhole and little bit harsh. Was it rutile effect?

[Mark C.]

Rutile glazes in reduction fire (thats my area of experience) can be problematic with pin holing
I have used a rutile base glaze for many decades by the ton and have seen my share of pinholes-Firing schedules-reduction amounts-glazing procedure-dusty dirty bisque ware can all be factors .
I like tin and zircon to opacify over Titanium Dioxide as noted above
Mark

[Natas Setiabudhi]

Mark C., on 13 February 2012 - 01:29 PM, said:

Rutile glazes in reduction fire (thats my area of experience) can be problematic with pin holing
I have used a rutile base glaze for many decades by the ton and have seen my share of pinholes-Firing schedules-reduction amounts-glazing procedure-dusty dirty bisque ware can all be factors .
I like tin and zircon to opacify over Titanium Dioxide as noted above
Mark

Okay thanks

[Marcia Selsor]

Rutile is a natural , but impure source of Titanium Dioxide. Rutile contains a bit of iron which adds to its coloring quality.
Marcia

[neilestrick]

You should really never need more than about 7% rutile in a glaze. It is one of the most refractory ingredients we use, so it can stiffen glazes, which can result in pinholing.

[Natas Setiabudhi]

Okay guys I really appreciate for the input.