kennedy james Posted November 15, 2013 Report Share Posted November 15, 2013 I want to make a black porcelain slip using mason stain. I bought a small bag (1/4lb) of Best Black 6600 Mason stain and mixed it my slip (less than 1 gallon). I contacted Mason to ask how much of the stain I should use but they are not really helpful... anyway the result it a light gray, I wonder if it's going to get darker after firing. anyone got experience making a black slip and knows how much stain I should use for 1 gallon ? Link to comment Share on other sites More sharing options...
Marcia Selsor Posted November 15, 2013 Report Share Posted November 15, 2013 Chris would know. She makes black porcelain with Mason stains. Marcia Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 15, 2013 Report Share Posted November 15, 2013 I use about 6 - 8 % ( by weight ) of the Best Black stain to make black slip. It does look grey in the bucket but fires black. Link to comment Share on other sites More sharing options...
kennedy james Posted November 15, 2013 Author Report Share Posted November 15, 2013 so for 10 pounds of slip I would need between 0.6 and .08 lb of stain, correct ? (sorry I'm not so sure of my math skills...) Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 15, 2013 Report Share Posted November 15, 2013 For ten lbs of slip you would need: 10 lbs x 16 oz = 160 oz ... so approx 10 oz - 13 oz. Link to comment Share on other sites More sharing options...
kennedy james Posted November 15, 2013 Author Report Share Posted November 15, 2013 why 16 oz ? I don't understand the logic.... Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 15, 2013 Report Share Posted November 15, 2013 why 16 oz ? I don't understand the logic.... 16 oz in one lb ... or am I wrong?? It is Friday .... Link to comment Share on other sites More sharing options...
kennedy james Posted November 15, 2013 Author Report Share Posted November 15, 2013 I just dont understand the logic... yes 1lb is 16 oz, but I don't understand the maths here 6 % of 10lb is about 10z and 8% of 10lb is 13 oz so your math is right even if I don't get it haha I just found out this page: http://shop.clay-planet.com/stains.aspx it says "Black, being total color saturation, requires at least a 10% addition, usually higher to avoid grey" have you tried 10% ? do you think it's too much from your own experience ? 10 lbs x 16 oz = 160 oz ... so approx 10 oz - 13 oz. Link to comment Share on other sites More sharing options...
mregecko Posted November 15, 2013 Report Share Posted November 15, 2013 I believe she converted from ounces to pounds because ounces are better/easier for measuring small quantities. (10pounds) * (16 oz / pound) = 160 oz. 8% of 160oz = 12.8 oz. Which is easier (for me at least) than saying 0.8 lbs. It's hard to measure out 0.8 lbs on a scale. It's just a matter of preference. Link to comment Share on other sites More sharing options...
kennedy james Posted November 15, 2013 Author Report Share Posted November 15, 2013 i see... thanks everyone for the help ! Link to comment Share on other sites More sharing options...
Guest JBaymore Posted November 15, 2013 Report Share Posted November 15, 2013 454 grams to the pound. .8 x 454 - ............ you do the math. best, ............john Link to comment Share on other sites More sharing options...
ayjay Posted November 15, 2013 Report Share Posted November 15, 2013 anyway the result it a light gray, I wonder if it's going to get darker after firing. Mine does: 10% mason stain (6657 I think is what I have). It's actually a more solid black than the pic shows, the speckly look is something the camera has picked up, iy doesn't look like that in the flesh. Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 16, 2013 Report Share Posted November 16, 2013 I just dont understand the logic... yes 1lb is 16 oz, but I don't understand the maths here 6 % of 10lb is about 10z and 8% of 10lb is 13 oz so your math is right even if I don't get it haha I just found out this page: http://shop.clay-planet.com/stains.aspx it says "Black, being total color saturation, requires at least a 10% addition, usually higher to avoid grey"[/size] have you tried 10% ? do you think it's too much from your own experience ?[/size] 10 lbs x 16 oz = 160 oz ... so approx 10 oz - 13 oz. I would say that it is really not that big a difference in cost to be sure you get what you want ... So go with 10% and be sure ... Also the math is easier! Link to comment Share on other sites More sharing options...
perkolator Posted November 21, 2013 Report Share Posted November 21, 2013 10% is right about the starting point you want to use any mason stain in glazes, slips, clays, etc if you want to get the intended color. Link to comment Share on other sites More sharing options...
clay lover Posted November 21, 2013 Report Share Posted November 21, 2013 Could you just use black underglaze? It's really black , not spendy and readily available. Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 21, 2013 Report Share Posted November 21, 2013 You really cannot use black underglaze as a slip. It has different properties. Link to comment Share on other sites More sharing options...
neilestrick Posted November 21, 2013 Report Share Posted November 21, 2013 Could you just use black underglaze? It's really black , not spendy and readily available. Let's compare prices: Black stain is roughly $15 per pound, so a 10 pound (dry) batch of slip at 10% stain would cost you $15 in stain plus the price of the slip itself, which could be 50 cents per pound for porcelain, so another $5, which puts the whole batch at $20. Speedball black underglaze (which I use), one of the least expensive out there, is about $10 per pint, so you could buy 2 pints for the same $20. It comes very thick and needs to be watered down, so you could actually get at least 3 pints out of it. So 3 pints (conservatively) of underglaze for $20. How much slip does 10 pounds of dry porcelain make? Anyone? I do agree that using underglaze is an option, depending on what you need it for. But I think for most applications it can be used just fine in place of slip. It can be applied to leather hard, bone dry or bisque, unlike slip. I get a lot of customers asking me about making colored slips with stains, and once I explain what it takes to makes it, with the weighing and mixing and testing and all, they are not excited to do it. I then recommend underglazes and they are happy. Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 21, 2013 Report Share Posted November 21, 2013 "I get a lot of customers asking me about making colored slips with stains, and once I explain what it takes to makes it, with the weighing and mixing and testing and all, they are not excited to do it. I then recommend underglazes and they are happy." Hmmm .... I can see I need to have a colored clay & slips workshop in your area! Link to comment Share on other sites More sharing options...
Julie P Posted February 4, 2020 Report Share Posted February 4, 2020 On 11/15/2013 at 9:08 PM, mregecko said: I believe she converted from ounces to pounds because ounces are better/easier for measuring small quantities. (10pounds) * (16 oz / pound) = 160 oz. 8% of 160oz = 12.8 oz. Which is easier (for me at least) than saying 0.8 lbs. It's hard to measure out 0.8 lbs on a scale. It's just a matter of preference. so much easier in grams Link to comment Share on other sites More sharing options...
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