TainiNZ Posted October 12, 2015 Report Share Posted October 12, 2015 My question is this, after watching Lana Wilsons video where she is using Paper Slip multiple times ie many colours on one piece of work can the same method be applied using Under Glazes. Link to comment Share on other sites More sharing options...
GiselleNo5 Posted October 12, 2015 Report Share Posted October 12, 2015 can the same method be applied using Under Glazes. I use underglazes fairly extensively. The main difference, I think, is that since slips are opaque and flat the top coat will cover whatever's underneath. Underglaze is transparent to semi-transparent and may possibly mix with the glaze beneath to create a different color. Depends what look you want. Link to comment Share on other sites More sharing options...
TainiNZ Posted October 12, 2015 Author Report Share Posted October 12, 2015 Thanks, appreciate your input. Link to comment Share on other sites More sharing options...
Benzine Posted October 12, 2015 Report Share Posted October 12, 2015 I tell my students underglazes are like a colored slip, emphasis on "like". Slip is just that, a liquid clay, sometimes with colorants added, sometimes not. When applying slip for surface deocration, it tends to work better, before the clay body gets too dry. Otherwise, it can crack off. Underglazes are similar to slips, but have other additives, beyond colorants, like frits, which help them adhere to the clay body. Because of this, they can be used at any stage; on leatherhard clay, bone dry and even bisqueware. Both slips and underglazes can be mixed, like paint, to create new colors, blend/ shade them, etc. While either can affect glazes, that are put on top of them, they will not mix with the glazes, as neither becomes molten like glaze does... Unless they are over fired. Some of the colorants in the slips or underglazes, can alter the color of the glaze, or cause other issues however. Link to comment Share on other sites More sharing options...
Venicemud Posted October 12, 2015 Report Share Posted October 12, 2015 I have used both homemade colored slips and Amaco Velvet underglazes in the Lana Wilson manner successfully. I believe that Lana Wilson does the same in the video you mentioned. Some underglazes are certainly opaque, probably not all. Link to comment Share on other sites More sharing options...
Cavy Fire Studios Posted October 12, 2015 Report Share Posted October 12, 2015 Resident Underglaze Rodent, at your service! ♥ Okay, to be honest, I think it boils down to two things: 1. Cost 2. Desired effect It is a LOT cheaper to make a big 'ol bucket of slip than to buy commercial underglazes for big surface treatments. If I used my white underglaze instead of slip to cover my terracotta for underglazing, I'd be in the poorhouse in no time flat! So, if you are planning on using a lot of only a few set colors, I'd totally use slip. And effect? Well...dang. There are a gazillion factors here. Are you working with dark, red, or white clay? Are you looking for opaque or transluscent color? What temperature are you firing at? Do you want to layer? What glazes are you using? I know it sounds like a pain, but these are pretty important things to consider. Happy creating! -Guinea P.s. This is one of my favorite pieces I've done with slip and underglaze. The slip is white over terracotta, and I used mason stain for the brown and yellow (with gerstley borate added for flux). The leaves are Mayco's Apple Green, and the dark shading is watered-down mason stain Flourentine Green with gerstley borate. The gray shading is watered-down Amaco Velvet black, and the outline is Clay Art Center's Baltic Black A. ♥ I tend to use the same coloring technique with underglaze as watercolor. Link to comment Share on other sites More sharing options...
bciskepottery Posted October 12, 2015 Report Share Posted October 12, 2015 In a workshop with her, Lana used underglazes, layering some, mixing some to make transition blends, etc. Link to comment Share on other sites More sharing options...
GiselleNo5 Posted October 12, 2015 Report Share Posted October 12, 2015 I totally forgot about the timing issue mentioned by Benzine. Slip is just that, a liquid clay, sometimes with colorants added, sometimes not. When applying slip for surface deocration, it tends to work better, before the clay body gets too dry. Otherwise, it can crack off.Underglazes are similar to slips, but have other additives, beyond colorants, like frits, which help them adhere to the clay body. Because of this, they can be used at any stage; on leatherhard clay, bone dry and even bisqueware. I'm so glad you mentioned this, I didn't even think of mentioning this aspect. I think it's something we've all learned the hard way like when it's too dry to attach handles and not picking up large greenware pieces one-handed and putting pressure on the rim and side. LOL Link to comment Share on other sites More sharing options...
bciskepottery Posted October 12, 2015 Report Share Posted October 12, 2015 In her workshop, Lana applied underglaze to a slab, let the underglaze dry to a tacky surface, then applied another underglaze. After going soft leatherhard, the slab was flipped and underglazes applied to the second side. Once those dried to a soft leatherhard, she would stretch the slab by tossing it against the table top to soften the line edges and thin the slab. Then, she would cut out her item and assemble it. All underglazes were applied pre-formation, not after. Link to comment Share on other sites More sharing options...
Min Posted October 12, 2015 Report Share Posted October 12, 2015 I think there is some confusion going on as to which of Wilson's processes the op was asking about. Paper slip with stains in this demo: https://www.youtube.com/watch?v=OlVI_XfHVSE Other clips of her using slips and ug's on bisque, soft clay and leatherhard. Perhaps the op could clarify which method she is asking about? Link to comment Share on other sites More sharing options...
bciskepottery Posted October 12, 2015 Report Share Posted October 12, 2015 Her technique for making the slabs with either paper clay mixed with mason stains or underglazes is the same. Either way will work. Link to comment Share on other sites More sharing options...
TainiNZ Posted October 13, 2015 Author Report Share Posted October 13, 2015 Hi everyone, thank you so much for your replies, this novice will take your tips and write them up in her note book they have all been so helpful. Jan B. Link to comment Share on other sites More sharing options...
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