I am useing .7 % of Silican Carbide in my Copper Reds & Oribe glazes. I have good luck in the Oribe and starting to have good luck in my Copper Reds. In the Copper Reds I have pin holes from the Silican Carbide, but I am getting Ox Bloods. It has been a process but I am getting red. I think it will be a learning process for you, I would make a bunch of test with differing percentages of Silican Carbide, and I put a small percentage of Iron Ox. in the glaze with the Tin Ox.
I am embarrassed to say I don't know how to address you in a proper, but informal manner. In the U.S. we usually address each other very informally by our first name, so I am George. I believe you are our first member from Malaysia. I hope we can be of help to you with your pottery.
Low cost flat lapping disc can be used on you potters wheel if you, drill bat pin holes in it, and provide a trickle of water to cool it. At amazon.com, 120 grit for aggressive material removal. Click the image to purchase
Members have had great things to say about John Britt's new book, Mid-Range Glazes. Click the image to buy from Amazon.com
If you just want to spout off, it is best accomplished as a blog posting. If you want to get more guidance and ideas from other members, ask a question as a new discussion topic. In the upper right corner of the lists for both types of posting, you will find an "+Add " button. Clicking it will open an editor where you create your posting. 4/16/2014