Speedball 001050 Underglaze, White, 16OZ

Here’s a short, personalized review you can use:⸻I’ve been using the Speedball White Underglaze on my pottery pieces, and it’s been a great addition to my studio. Once I gave it a good stir and thinned it slightly, it brushed on beautifully—smooth and opaque in just two to three coats. I love using it for sgraffito and surface designs where I want crisp, clean lines, and it fires to a nice bright white under clear glaze. It holds up well through bisque and glaze firings, even at Cone 6. Definitely a solid staple for any potter looking to add reliable white detailing to their work. The only concern that I feel obligated to state about this product is that if you’re going to apply a clear glaze over it, you definitely should be using Speedball clear because it does not seem to like when I use another brand’s clear over it and will occasionally bubble or crack if I don’t use the Speed ball clear.. I called Speedball to ask them about this problem and they confirmed that this is a known issue.

I have been looking for a black underglaze that didn't run under clear for years. This did not run! I'm very happy about the results. The bottle says to fire to at least cone 05, but I fired this to cone 06 with a 10 minute hold. Hopefully this helps another potter.

I use this on sgriffito plates for ceramics class and the color is gorgeos it coats nicely with clear coat over it.

So the color is absolutely beautiful which is why I spent so much time trying to make this work for me. Im not sure if I was sent a very old bottle or this is just how these underglazes are by nature but it was extremely gritty/chalky which makes even or detailed application almost impossible. I’ve mixed it, sieved it, and tried adding gum solution, which helped slightly but not enough. When fired the resulting color is a beautiful golden yellow, nicely saturated like amaco velvets. The color is one I haven’t found in either Mayco fundamentals or amaco velvets but the consistency makes application so challenging I think it would be easier to make my own underglaze at this point. Don’t buy or you’ll be tempted to use and then spend hours wiping it off your pot cursing speedball for this crappy product…

The color is very pretty in the jar. It comes out a bit more pink after it's done being fired and glazed. However, it is a great base color so adjust the skin color as needed. I think it's a great investment rather than making a skin tone color yourself and having no clue what it would look like after it comes out. With this glaze, I am able to know how it looks and modify it to my liking.Easy to paint on - very smooth. Wasn't too thin or thick. Very good viscosity. I would say this is quality underglaze, but also it is one of the first underglazes I have purchased for myself. The only other experience with underglaze I have is the ones I use at my local pottery studio. I like this glaze very much.Only giving it 4 stars because I didn't expect it to have a pink tint to it. I thought it would be more of a cream.

I like that the bottle is the same width top to bottom, this allows even a wide brush to be dipped into the bottle easily. I use 3 coats at cone 6. The result is opaque, pure white without tints of other colors. Additionally, this white can be used in 2 or 3 coats beneath other glazes to give clean, bright results. White, red and brown clays can make glazes appear dull or "muddy", if you use this white in a couple of coats at greenware (recommended) or bisque, it's as if the glaze you apply over this underglaze has been applied to a porcelain type clay. You can use it alone or beneath other underglazes, other opaque or translucent glazes including clear. I've used this white to cone 10. If used alone to cone 10, be sure you have 3 full coats, allowing each coat to dry before applying another and if you're firing higher than cone 6, maybe add a 4th coat to be safe that you have good coverage. I've had this brown slightly in high fire, atmospheric firings such as wood fire, soda fire and salt fire. Hope helpful!

The color itself is very nice. However, it is very difficult to work with. The consistency is very thick. If you dilute it with water, you get a kind of grainy liquid which doesn't create an opaque coverage even after 3 layers. It dries up extremely quickly on the brush itself and makes it difficult to work with (compared to other brands such as amaco or mayco). Another issue is when it dries up on the greenware it turns powdery and it easily rubs off, so when you're applying another coat - it just brushes off the previous one. Anyway, don't expect to get consistent and accurate results with this underglaze. But hey, sometimes it's ok to have your work turn out a bit on the "artsy" side.

Excellent creamy white underglaze