Spiral Balance Tip Color = what weight?

A home owner from Elgin, IL says:
I ordered 6 blue tip spiral balances, for my old Alcoa vinyl windows, to replace the old blue tip spiral balances. After replacing the 2 balances in 1 window, I charged the balances equally. The sash still drops like a ton of bricks. I even tightened them another turn back and forth, testing the sash each time. In the end, one of my blue tip balances snapped and broke and still wasn't strong enough to hold the sash up before that. Is it possible that I need green or black tips? Is there a specific weight that each color will hold when charged properly?
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Donna from SWISCO responded:

First, check to see if the new balances matched up to the length of the original balances.

Next, remove the window sash and place it on a scale.

S600-29 with Blue tip will carry a window sash weight range of 12 through 31 pounds

S600-29 with Black tip will carry a window sash weight range of 31 through 40 pounds

This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.

A home owner from Elgin, IL says:
How much will green hold? It's weird because my current (old) tips are blue. Is it out of line to replace the blue tips with black tips to make up for the lose of friction in the jamb? The windows are about 15 years old. I also noticed that the 28" only offers red and blue tips and NOT black. Say my measuring was off, could me saying 29" blue tips instead of 28" blue tips make the balances not hold my window open?
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Donna from SWISCO responded:

The S600-29 is available with Red, Blue, or Black tip. There is not a Green tip available for the S600-29.

Yes, the length of the balance is important and will make a difference in the function of the window, match up the length to the original balances.

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