I can understand your concern. Unfortunately, without a model number, I will not be able to provide specific information. However, a black or blue liquid leaking from the bottom of a refrigerator is usually associated with the foam insulation inside the cabinet. No, it is not toxic. To prevent this type of leak, the liner under the cabinet will need to be sealed. You can use some rtv sealant # 8201711 that is available at
. I hope this helps you. If you would like more assistance, a complete model number will be needed and any additional details will be helpful and I will be glad to assist you further.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services