Thing To Remember About All These Old Detergents
Is if they are phosphate based especially sodium hexametaphosphate (SHMP), you need to purchase with caution if you intend to go rather than show.
SHMP more than STPP is hygroscopic and will take up moisture quickly if stored either improperly, and or for long periods under less than optimal conditions. Once this happens with SHMP and STPP they become less to nil in use for their original detergent builder purpose.
If you've ever picked up an old box of detergent from the phosphate era and it is hard as a brick and or after opening it the stuff starts clumping, there you are then.
Once one is finished with the last of the open box of Burst detergent (am fighting a on going race to get shot of it before the stuff turns into brick), am probably done buying older stuff for awhile. That is unless something extraordinary comes along like a case of Dash! *LOL*
Am finding most modern TOL laundry detergents such as those by P&G, Henkel, and other EU sources really do well enough on their own without phosphates. More over they use "anti gray" technology to prevent encrustation. Only time one would bother is using various soap based liquid detergents, the vintage Persil soap powder, and so forth.