it is bootstrapping! you use the mirror you are creating to magnify its own errors tens of thousands of times. Grit sizes are can be sorted by the time it ta

it is bootstrapping! you use the mirror you are creating to magnify its own errors tens of thousands of times. Grit sizes are can be sorted by the time it takes them to settle out of a column of water. For a given material, finest take the longest (Elutriative Time).[0] un-affiliated: commercial source for the parents third link [1] I will add that building better telescope mounts for pre-existing mirrors can be very rewarding in itself. and can be an easier way to get into the hobby than mirror making, especially without access to other experienced mirror makers. 0 https://en.wikipedia.org/wiki/Elutriation https://en.wikipedia.org/wiki/Elutriation 1 https://angelgilding.com/ https://angelgilding.com/