I don't know what resistors they use, but I got a nice pink colour using a 5ohm resistor on the blue diode. My daughter loves it. It's a similar colour to the BH. I don't know if they like posting official resistor values for forum colours.
Resistors are cheap, buy a few and test for the colour shade you like. Eg 3, 5, 10 ohms
Thanks for the reply. The reason I ask is that we accidentally cut through one whilst doing some DIY, and don't know what type it was .