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Mossyrock

Member Since 22 Aug 2010
Offline Last Active Today, 10:19 AM
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Posts I've Made

In Topic: Lee Kang-Hyo: Making Giant Jars

Yesterday, 01:02 PM

Beautiful story….thanks for posting the link. I'd hate to be the one to clean up after his glazing session though!  ;)  


In Topic: Who Gives Their Own Work As Gifts?

26 December 2014 - 06:00 PM

Over the years, I have given pieces of various kinds as gifts……wedding, Christmas, birthdays…..any kind of celebration, to both family and friends.  When I go to their houses, I'm always happy to see the pieces in use, however, there are some (my mom in particular) who have them on shelves and it's obvious they're used for viewing only.  This past Thanksgiving, mom was looking for something large to put fruit on and I went to the living room where she had a very large handbuilt tray I had made her and my dad for their 50th anniversary on display.  Here mom, this will be perfect!  Her reply….."Well, I never thought about actually using it."  I gathered up several more pieces to put in use for Thanksgiving dinner servings…..I hope she'll remember those pieces when she needs 'pretty trays' to serve food on again. :)  

 

As for myself, I'd rather receive a piece of friends pottery or sewing or something that they had made than anything they could purchase at a store.  


In Topic: potters stool

22 December 2014 - 11:21 AM

Years ago, for a couple of bucks, I found a vintage green (1940's or so) armless desk/typist chair that changes height by turning the seat left or right.  I removed the back, but left the casters.  It's comfortable and adjustable, easy to clean and easy to get on and off of because of the casters.  Works great for me.  I've seen them in thrift stores.  


In Topic: Spectrum Glaze Problem

17 December 2014 - 11:54 AM

This was another email I received from Jacob at Spectrum Glazes.  He sent the gum and suspender, but I haven't had time to give it a try yet.  Just thought the extra explanation may help someone else out there.

Brenda

 

I should be clearer with this, old glazes have two materials that can be eaten by bacteria over time. They're the only organic parts of a glaze so they're the only things that can cause a glaze to "go bad" as it were, although you can always re-add them to make a glaze work again. None of the parts of the glaze that form the glass after firing are capable of going bad short of extraordinary circumstances. 

The gum is what holds it together. When it's missing you get the glaze flaking apart when it dries because the water isn't holding it together. The suspender is another part and keeps the glaze from settling out from the water. What was so strange about what you described is that only the gum is gone, the glazes haven't settled out. It's two different materials that prevent those issues, but they usually get destroyed at the same time because they're the only two things susceptible to bacteria. It's just quite rare to have only one go completely and the other not at all.

 

As for how to use them, I'll send both just in case, but you'll likely only need the brushing media unless the glazes start settling out. As for how to use it, take about a tablespoon of the media, it's just CMC gum already dissolved in water, and add it to the pint. Stir it in as best you can, a stick or spoon should be fine, a blender is always better, and let it sit for 15-20 minutes, then do a test, and see if the flaking happens again. If it's still happening, it should at least be dramatically less you've had so far and just add another spoonful of the media to the glaze. It's always best to go slow at first and have to add more because adding is easy, it's not so easy to take out once it's in. Adding too much gum won't be a large problem though. Too much gum will likely just make it very slow to dry and potentially thicken the glaze a bit.

If you have settling issues, the suspender will be the same process, although it's more likely a blender will be necessary, as the suspender is very thick. With the suspender I would go by the teaspoon rather than tablespoon after the first because too much suspender will be a larger problem than too much gum. Too much suspender can really make a glaze go to jelly.


In Topic: Spectrum Glaze Problem

03 October 2014 - 11:25 AM

I had some difficulty with the 900 series as well, but not nearly as much as yours show. The Old Copper in particular used to cake up and tended to flake off, especially as the jar got older. I lightly sanded pieces to try and even it out and compress the layers a bit, but towards the bottom of the jar that wasn't possible because of the flaking, even after adding some gum to the jar. I always loved the way this series looked but it was a challenge to brush on evenly and cleanly.

Nancy, the Old Copper is the glaze in the picture of the mugs that has huge curling and flaking (far left).  I have some commercial glazes that are several years old and haven't had a problem with them adhering to bisqued pieces.  I know the glazes haven't frozen while I've had them so I don't know what would have caused the gum to go.  I don't have a lot of knowledge regarding glaze chemicals, but this is the first time I've experienced this problem.