I wanted to try the emboss-resist technique so I cut a sheet of Whisper White cardstock in half and heat embossed the tree images on both pieces. I sponged the northern lights on one of them but when I was finished 2 of the trees looked pink so I threw it away and sponged the northern lights on the other piece. Again I had pink trees so I posted a photo of it on Pootles Craft Forum because there are so many talented artists on there and I knew they would give me some advice.
Tracy Elsom commented advising me that Melon Mambo and the retired Blackberry Bliss inks cause this because they have a really strong pigment. Guess who used both of these colours : ) I thought I was going to have to throw it away and start again but thanks to Tracy's advice I could continue making the card. YAY!