Not sure at what stage your at with the Shellac but a little bit of advice from a really really old friend. Pore the shellac, I presume your purchase was in a mixed form, into a glass jar. Cover the top with grease proof paper then replace the lid. This will ensure the shellac does not corrode through any tin/metal something that will happen but after quite some time and spoil the shellac colour with rust contaminents. To purify, or clear the shellac from an orange to a clear, place the jar onto a window sil or in a situation with as much sun daylight as possible. You'll see the difference within days as the orange settles lower. The shellac clear at the top becomes the finishing coating for French Polishing. Good shellac should be branded as ABTN (Angelo Brothers Truly natural) which is a brilliant brand name for the Lac Insects Sh*t. Not sure about where you reside but down here denurtured alcohol, methylated Spirits, or SD Alcohol is normally a purple colour to give a yuk taste that prevents some from drinking the mixture. The purple'ish haze will also be visible on finished surfaces in given light angles. Isopropyl Alcohol is your go to mixture for Shellac and is also an excellent cleaning agent (eg windows) for various surfaces. Shellac is a wonderful sealer for wood and oily timbers and can be overcoated with numerous types of surface coating products. Want eveidence? check out museums, antique stores etc and see the wonders of shellac/French Polish finishes. Its the only sealer I personally use on all my wooden hobby projects. Hint, if when applying shellac it turns white it means the product is too thin (body it up), the ambient is too cold or the humidity is above 60% (warm the premises or wait until humidity drops and/or temperatures increase.) Shellac whether in its orange or clear form is non toxic, has extensive uses from glazing chocolates, sweets, pharmaceutical pills, glazing of fruits during photographing sessions etcetera etc etc. If you go ahead experimenting with diluted white H2O based glues then also experiment with Shellac. BTW if the product is too thin leave the lid off the container, the alcohol will evaporate and leave a thicker solution. Apologies if I interrupted your quest for the perfect hank(s) best of luck and cheers.