Lettering a marriage crock

[rox54]

I have a request to make a marriage crock and my customer sent me these pictures. Is this salt fired?  I have lettering stamps I can use but need suggestions for glazing at fine 6 electric. TIA

[Pres]

I do not believe it is salt fired. Seems like an underglaze or wash of cobalt washed off of high areas with a clear glaze over top,IMHO.

 

best,

Pres

[rox54]

15 minutes ago, Pres said:

I do not believe it is salt fired. Seems like an underglaze or wash of cobalt washed off of high areas with a clear glaze over top,IMHO.

 

best,

Pres

Thank you for the fast, helpful reply! Would you use cobalt oxide or cobalt carbonate? I've never used a cobalt wash but am willing to try! Here is a closer shot of the pot. I think I see a tan clay at the bottom? 

[Pres]

So the glaze is a white or off white glaze. Oxide or Carbonate will work, However, I would definitely do some test tiles. The carbonate is weaker in color, but could be used if that is what you have. 

best,

Pres 

[rox54]

34 minutes ago, Pres said:

So the glaze is a white or off white glaze. Oxide or Carbonate will work, However, I would definitely do some test tiles. The carbonate is weaker in color, but could be used if that is what you have. 

best,

Pres 

I will definitely test. Would you say the cobalt is over the white glaze? The band at the top and bottom makes it appear that way to me. 

[Pres]

I believe you may be right, but then again testing should identify that. I still think that the logo/lettering is stained before glazing. the banding at top and bottom may be before or after. Testing should help you decide on when to do it.

 

best,

Pres

[Min]

Cobalt is really strong, it can show through a covering white glaze. You could also try a cobalt slip on greenware then wiped back. Unless you use a really stiff (non fluid majolica type glaze) I think you might get some bleeding / fuzzy edges if you use a straight cobalt wash as cobalt is a flux. Pot below has a fairly heavily opacified white glaze overtop of an iron slip plus cobalt.

[neilestrick]

Looks like a clear glaze on a light colored stoneware to me. They come out gray in reduction firing when under a clear. I'd use a blue underglaze. Flood it into the letters with a squeeze bottle or syringe and you'll have very little cleanup to do, if any. Then a lightly tinted glaze, on a light colored stoneware with speckles.

[rox54]

Thank you all for sharing your knowledge. I'm looking forward to testing your suggestions!

[Mark C.]

Not salt pots for sure

Just add some colbalt carb to a little water  mix it up in air tight container. Use a brush to apply

This is cone 10 porcelain with a clear glaze over on these baby bowls I made for family members and friends (I do not do this for the public )

Cobalt is hard to remove so be carefull applying .Use a small brush witha good tip. I turn the bowls on a wheel at slow speed to band them

.

[rox54]

Very nice bowls and helpful advice. Thank you!

[Denice]

Laguna has a Bmix with Speckles C5/6  that might work for your clay,   you may have another white clay with speckles in your area.   Denice

[JohnnyK]

18 hours ago, rox54 said:

Thank you for the fast, helpful reply! Would you use cobalt oxide or cobalt carbonate? I've never used a cobalt wash but am willing to try! Here is a closer shot of the pot. I think I see a tan clay at the bottom? 

The tan clay at the bottom is just that...the foot of the piece is unglazed. You can also try using a blue underglaze in the recessed letters and the bands, coat the letters and bands with wax resist and then finish glazing with whatever floats your boat...