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#1 
? nepheline?
- Group: Members
- Posts: 6
- Joined: 19-July 10
Posted Yesterday, 11:36 AM
I have been working with crackle glazes for a long time but never on fonctional pieces. I have always coloured the cracks with India ink but I know it is not very good for your health. I have tried iron oxyde but it only works on very pale glazes. I have also tried cuttlefish ink but it does not work. Any idea as to what I could use to obtain black lines and not poison my customers ? I would be grateful if someone can help me.
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#2 ? Mossyrock?
- Group: Members
- Posts: 104
- Joined: 22-August 10
- LocationHigh Point, NC
Posted Yesterday, 03:44 PM
I have used AMACO's black velvet underglaze to highlight the crackle in a glaze. I usually thin it a little, paint it over the crackled glaze, let it dry, then wipe excess off with a damp sponge.
Brenda Moore
Mossy Rock Creations
High Point, NC
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#3 ? JBaymore?
- Group: Moderators
- Posts: 811
- Joined: 06-April 10
- LocationWilton, NH USA
Posted Yesterday, 05:17 PM
I have used AMACO's black velvet underglaze to highlight the crackle in a glaze. I usually thin it a little, paint it over the crackled glaze, let it dry, then wipe excess off with a damp sponge.
Please note the part of the original poster's question that said "Any idea as to what I could use to obtain black lines and not poison my customers ?"
Have you had these pieces treated this way tested for the potential of getting metal oxides into food stuffs?
The MSDS for these products (which are mighty skimpy on the information I might add) say they do contain metal oxides and "inorganic stains" along with frit, clay, and water and a binder.
I'd personally be interested it KNOW if this is a good practice.
best,
..............john
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#4 ? Lucille Oka?
- Group: Members
- Posts: 491
- Joined: 02-July 10
Posted Yesterday, 05:20 PM
Amaco underglazes are formulated to be fired and covered with a lead free clear glaze. Velvet underglazes can be used unglazed but not on surfaces that come in contact with food or drink.Functional ware or ware that comes in contact with food or drink should not be used with crackle glazes.
If the ware is purely decorative and you still want to stain the crackles you can try strong coffee or tea or a diluted tempera paint, water color, or an acrylic paint but be sure to wipe off the acrylic paint quickly because it dries fast.
Sic enim dilexit Deus mundum ut Filium suum unigenitum daret ut omnis qui credit in eum non pereat sed habeat vitam aeternam.
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#5 ? JBaymore?
- Group: Moderators
- Posts: 811
- Joined: 06-April 10
- LocationWilton, NH USA
Posted Yesterday, 05:32 PM
Functional ware or ware that comes in contact with food or drink should not be used with crackle glazes.
Guess I need to hang up the profession. 
best,
.............john
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#6 ? Lucille Oka?
- Group: Members
- Posts: 491
- Joined: 02-July 10
Posted Yesterday, 05:39 PM
What's your point?
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#7 ? Idaho Potter?
- Group: Members
- Posts: 199
- Joined: 26-August 10
- LocationBoise, Idaho
Posted Yesterday, 06:00 PM
I think that Raku--as originally intended--usually ended up with a crackle glaze and the tea bowls were meant to be used in ceremonies to serve teas. However, back then they also used lead based glaze so they could have a low melting point. Did our reluctance to continue using the pottery for food/drink come more from fear of lead or fear of bacteria? I saw a TV program that included ancient tea pots that needed to have tea brewed in them on a regular basis or the pots would disintegrate. It was an episode of Sherlock on PBS so it may have been all fiction--but maybe not. The pots seemed to be unglazed. Is tea the secret sanitizer?Personally, seeing as teas are made with boiling water, I think that takes care of the bacteria problem. I fire Raku a lot. When sold, there is always a note attached that the vessels are not to be used for food or drink. After saying that, when I make tea bowls, I DO use them for tea--only tea. Not dead yet, but hey, that's what the vessel's intended use.
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#8 ? bciskepottery?
- Group: Members
- Posts: 395
- Joined: 28-June 10
- LocationNorthern Virginia
Posted Yesterday, 06:03 PM
Nice chawan, John. It is easy to imagine cradling the cup full of tea.0
#9 ? Idaho Potter?
- Group: Members
- Posts: 199
- Joined: 26-August 10
- LocationBoise, Idaho
Posted Yesterday, 06:14 PM
Nepheline,Well, shoot! I got sidetracked. If you want the pot to be truly functional, use a non-crackle glaze on the interior, then you only have to test how soon the india ink, or whatever, will last in the dishwashing. I have glazed (to cone 5-6) the interior of a bowl, and then raku fired the exterior expecting crackle. I leave a unglazed band between the cone six and raku glaze (it becomes black during the post-fire reduction). My clay is a raku clay that can take lots of different temperatures. I have also glazed the interior with cone 05-06 glaze which matures during a raku firing. Not knowing what you are firing your work to, makes it hard to adequately address your problem.
Shirley
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Source: http://ceramicartsdaily.org/community/topic/2657-india-ink-or-what-else/
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