plastic turning even with stabilizer?

[Jiglip]

I have just started pouring plastic and when reheating blues turn green, red turns orange and gray turns green. I have been adding 5 drops of stabilizer to four ounces of plastic when reheating but still turning. I am using a pyrex glass cup in the microwave to heat 4 ounces of plastic and heating about a minute and a half. Does anyone have any recommendations or suggestions?

[Mic]

Try heating in shorter amounts of time, maybe 30 seconds at a time and stir between each reheat. With a small batch of plastic like that it doesnt take much time to heat up and make sure you stir often. Good luck and have a happy thanksgiving!

[pjmcla]

Temperature control is critical.  You really need a good thermometer of some sort to accurately determine the plastic temperature.  Some glitters will discolor plastic, especially on reheats.  I agree with shorter heat cycles and gentle, but thorough stirring to even the temp of the plastic.

[Jiglip]

Thanks for the info, I will be heating less and will stir more!

[captian chaos]

spend a couple of dollars on a thermometer they are invaluable as temps are CRITICAL

[ctom]

Be sure to chop up the re-heat plastic to dime sized pieces and add 15 drops of stabilizer and about an ounce of raw plastic. Stir well, then heat for 30 secs and stir. 30 more secs and stir. Do this until you get to 330, 340 for shooting....maybe even give it a go at 320. Reheats can be love/hate events, but if you try to hurry the re-melt I can assure that it will fall heavily on the hate side.

And on the thermometer, get a good one and be darned sure to stir the plastic BEFORE reading the temp....all plastic has a remarkable way of hiding cold spots and hot spots even in those small cups.

[hawgthumper]

Be sure to chop up the re-heat plastic to dime sized pieces and add 15 drops of stabilizer and about an ounce of raw plastic. Stir well, then heat for 30 secs and stir. 30 more secs and stir. Do this until you get to 330, 340 for shooting....maybe even give it a go at 320. Reheats can be love/hate events, but if you try to hurry the re-melt I can assure that it will fall heavily on the hate side.

And on the thermometer, get a good one and be darned sure to stir the plastic BEFORE reading the temp....all plastic has a remarkable way of hiding cold spots and hot spots even in those small cups.

X2 on what Tom said. You should always add fresh plastic on remelts. You can shoot at 320 easily.If you're handpouring,you want to keep it up there close to 340-350. And like everyone said,GET A GOOD THERMOMETER! You'll save a ton of money not burning your plastic when you do.

[Jason]

Once you get a thermometer and know what your temps are, the next thing you need to look at is what's changing colors: Plastic, Glitter, Colorant.  To do this you will need to break it down and just make clear baits, then try making clear baits with your glitter, then try it with just colorant, then with all three.  There are only 4 variables you are dealing with: heat, plastic, colorant and glitter.  It's just a process of determining which is causing the problem and then it will be easier to suggest a solution. 

Shorter cycles and lower heat may be the answer, but adding your glitter at a different point of the process may be the answer.  It would also be very helpful if you could share the brands of products you are using and the environment you are working in (i.e. 1000 Watt microwave with or without turntable - 5 years old).

Going through this process now will save you a lot of time, money and frustration over the long run.

Jason