Borax pentahydrate vs decahydrate

One has less borax per unit of mass.

Probably more dangerous too, no idea how much more though.

The pentahydrate is a bit more concentrated (less water in it), so you don't need to use as much. Use about 3/4 as much. No big deal. 291/381 = 0.76.

<span style="font-size: 10pt; font-family: Arial;" data-sheets-value="{"1":2,"2":"With Borax, two forms of hydrated salt exist - pentahydrate and decahydrate. Each form presents advantages based on the purpose for its use. Pentahedron offers a potent solution whereas Decahedron provides enhanced stability in multiple applications."}" data-sheets-userformat="{"2":513,"3":{"1":0},"12":0}">With Borax, two forms of hydrated salt exist - pentahydrate and decahydrate. Each form presents advantages based on the purpose for its use. Pentahedron offers a potent solution whereas Decahedron provides enhanced stability in multiple applications.</span>

<span style="font-size: 10pt; font-family: Arial;" data-sheets-value="{"1":2,"2":"With Borax, two forms of hydrated salt exist - pentahydrate and decahydrate. Each form presents advantages based on the purpose for its use. Pentahedron offers a potent solution whereas Decahedron provides enhanced stability in multiple applications."}" data-sheets-userformat="{"2":513,"3":{"1":0},"12":0}">With Borax, two forms of hydrated salt exist - pentahydrate and decahydrate. Each form presents advantages based on the purpose for its use. Pentahedron offers a potent solution whereas Decahedron provides enhanced stability in multiple applications.</span>