What causes white gold to crack during casting?
412852
Your crucible is leaking in oxygen, and the oxide content is building up in your metal
200007
The previous poster is right:  Gold is the most ductile metal.  "Since the cohesive forces are strong and the atoms do not become widely separated from each other during their rearrangement, the metal holds together while its shape is being changed."
178840
Cast is melted and poured, wrought is pounded and formed in a semi-solid to solid state.
206108
You would not want to plate white gold with platinum, you should do this with regular gold for the simple fact that yellow gold is cheaper than white gold so you would be cutting your overheads.
232174
Hi if its real leather use washing up liquid it makes leather crack
435707
gold as its conductivity is high
267064
yes gold is based on a 24 part scale for example when u have 14 kt gold u have 14 parts gold and 10 parts other material generally your gold vendors use nickel in white gold and for yellow gold generally copper zinc or sometimes a palladium so anything under 24kt gold is mixed with other material in one hand to cut the gold and in the other to make the gold stronger due to the malluability of gold.
1043035
pllatinum is not white gold. The pure element Au is not white gold. \n\nWhite gold is an alloy of gold mixed with white metals such as nickel, silver, and palladium. Like yellow gold, white gold glitters in a variety of carats: 18ct, 14ct, or 9ct. \n\nEighteen-carat white gold consists of 75% gold mixed with 25% white metals. New white gold rings are usually coated with a hard protective finish of rhodium, a silver-white metal like platinum. To keep a white gold ring looking its best, Gillett's recommends an annual replating of rhodium, since the coating wears off over time. \n\nPlatinum, an entirely different element than gold, is a white metal that is denser, heavier, and longer-wearing than gold. It's usually used in almost pure form and does not require a protective coating. Platinum is quite expensive, a platinum ring is perhaps twice the price of a similar ring made in white gold.
766215
rub it with a coin,\nif its gold, a soft metal,\nit should make an indent.\n\nif it is flaky, its fools gold.\n\nand here's a real simple test,\nif they are selling them dirt cheap, they are prob fake.\n\ntoo, what are the chances that a man walked into a mine, picked up some gold ( I am sure that a gold mine is guarded) \nand then managed to get it out of the country, \nand after all that, wants to sell it to you?
1048570
this is simply called grinding, it isnt cracking. this can b solved, talk to your dentist about it. it may not be at an extent where it needs to be solved but it is best to consult your dentist
298393
Uneven heating and cooling causes internal stresses which lead to cracking. To prevent or reduce it the part could be designed so that heat would flow through it more evenly thus reducing the thermal stresses.
164108
Those are only hairline cracks on the plaster. These cracks usually comes out if the plaster is not properly cured.
926845
I had similar bumps once when I was in a cast. They took the cast off and all these little itchy bumps were underneath. It had been driving me nuts. My doctor said it was an allergic reaction, probably to the dye in the coloured cast. I took some benadryl, used calamine lotion and the bumps went away within a week. Have you worn something new without washing it? It's probably an allergic reaction to something new that you've come into contact with. You can either see your doctor and ask for an allergy test or just treat the symptoms and hope they go away and never come back.
1048573
White gold is an alloy of gold and some white metals such as silver and palladium. White gold can be 18kt, 14kt, 9kt or any karat. For example, 18kt yellow gold is made by mixing 75% gold (750 parts per thousand) with 25% (250 parts per thousand) other metals such as copper and zinc. 18kt white gold is made by mixing 75% gold with 25% other metals such as silver and palladium. So the amount of gold is the same but the alloy is different.\n\n Traditionally nickel was used in white gold, however, nickel is no longer used in most white gold made today as nickel can cause reactions with some people. We do not use nickel in our white gold
231502
Really happens? Gold is quite inert but usually gold jewlery comes mixed with small amounts of other metals such as copper, nickel and silver to make it harder, and maybe is one of this metal that is reacting with the skin, or maybe the make up on the face.
326683
The incandescent bulb (which hopefully will become ancient paraphenelia in a few years) produces light by heating a tungsten wire white hot. At these temperatures, most materials "re-crystallizes" or moves.  "Hot spots" can develop that eventually lead to the failure of the filament, i.e. it breaks. When they break, they can rattle inside the bulb when you shake it.
125282
Most efficient? If you don't have a lab, then I would assume just doing your best at grinding off the top layer, and trying to melt the shreddings down into a >70% gold alloy. Since gold's melting point is OVER 1000 degrees Celsius, I suppose your best bet is to heat the grindings as much as possible, and then pounding them together into a single mass (like a black-smith...or 'gold-smith'). But you have to realize HOW LITTLE gold is actually on there. The layer is so thin...sometimes merely 2-3 micrometers. You're gonna get a lot of impurities, such as nickel and copper. Gold-plating is usually done on copper or silver; and in the case of copper, a thin layer of nickel is placed below the gold. And since the melting point of nickel isn't that far from that of gold, and copper's is almost EXACTLY that of gold's, you're gonna get a random mixture of crap. I imagine the process is more trouble than it's worth. I'd just go buy gold from alfa aesar or somewhere like that for cheap-as-free.