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Originally Posted by kickn
.............My goal is to get the anodising working in a very small setup before investing any more money in it - hence the clothing dye. I don't care if it fades, etc - as long as it works a little.
With the electrolyte I'll try it at a lower concentration - The bubbles are really coming off of it - its like an airstone - would that indicate it is indeed disolving the surface faster then its being created?
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The anodizing dye does work best. If your anodizing is right, other dyes like clothes dye and food coloring should work to some degree for testing if the part is in the ballpark concerning dying characteristics.
Bubbles will come off the part when it is being anodized, although it wouldn't indicate whether it is anodizing well, or not. If the current is lower there will be fewer bubbles produced in a given time frame versus a high current which will create more vigorous bubbling. I don't think I would use the bubble meter to adjust the current though............. and it doesn't indicate that dissolution is taking place.
Small parts do not take much current, so you need to be able to regulate the current to a finer resolution than larger parts. Just because they aren't burning doesn't mean you don't have too much current.